131421431 has 4 divisors (see below), whose sum is σ = 135660864. Its totient is φ = 127182000.

The previous prime is 131421401. The next prime is 131421439. The reversal of 131421431 is 134124131.

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

It is a cyclic number.

It is not a de Polignac number, because 131421431 - 2¹⁰ = 131420407 is a prime.

It is a super-2 number, since 2×131421431² = 34543185052175522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131421439) 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, 2119670 + ... + 2119731.

It is an arithmetic number, because the mean of its divisors is an integer number (33915216).

Almost surely, 2^131421431 is an apocalyptic number.

131421431 is a deficient number, since it is larger than the sum of its proper divisors (4239433).

131421431 is an equidigital number, since it uses as much as digits as its factorization.

131421431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4239432.

The product of its digits is 288, while the sum is 20.

The square root of 131421431 is about 11463.9186581204. The cubic root of 131421431 is about 508.4193416295.

Adding to 131421431 its reverse (134124131), we get a palindrome (265545562).

The spelling of 131421431 in words is "one hundred thirty-one million, four hundred twenty-one thousand, four hundred thirty-one".