131400421 has 4 divisors (see below), whose sum is σ = 135931500. Its totient is φ = 126869344.

The previous prime is 131400397. The next prime is 131400433. The reversal of 131400421 is 124004131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30096196 + 101304225 = 5486^2 + 10065^2 .

It is a cyclic number.

It is not a de Polignac number, because 131400421 - 2¹¹ = 131398373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131400395 and 131400404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131400491) 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, 2265496 + ... + 2265553.

It is an arithmetic number, because the mean of its divisors is an integer number (33982875).

Almost surely, 2^131400421 is an apocalyptic number.

It is an amenable number.

131400421 is a deficient number, since it is larger than the sum of its proper divisors (4531079).

131400421 is an equidigital number, since it uses as much as digits as its factorization.

131400421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4531078.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 131400421 is about 11463.0022681669. The cubic root of 131400421 is about 508.3922469627.

Adding to 131400421 its reverse (124004131), we get a palindrome (255404552).

The spelling of 131400421 in words is "one hundred thirty-one million, four hundred thousand, four hundred twenty-one".