131234420 has 12 divisors (see below), whose sum is σ = 275592324. Its totient is φ = 52493760.

The previous prime is 131234417. The next prime is 131234423. The reversal of 131234420 is 24432131.

It is an interprime number because it is at equal distance from previous prime (131234417) and next prime (131234423).

It can be written as a sum of positive squares in 2 ways, for example, as 68095504 + 63138916 = 8252^2 + 7946^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 6561721 = 131234420 / (1 + 3 + 1 + 2 + 3 + 4 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 131234392 and 131234401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131234423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3280841 + ... + 3280880.

It is an arithmetic number, because the mean of its divisors is an integer number (22966027).

Almost surely, 2^131234420 is an apocalyptic number.

131234420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131234420 is an abundant number, since it is smaller than the sum of its proper divisors (144357904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131234420 is a wasteful number, since it uses less digits than its factorization.

131234420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6561730 (or 6561728 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 131234420 is about 11455.7592502636. The cubic root of 131234420 is about 508.1780690971.

Adding to 131234420 its reverse (24432131), we get a palindrome (155666551).

The spelling of 131234420 in words is "one hundred thirty-one million, two hundred thirty-four thousand, four hundred twenty".