131431304 has 8 divisors (see below), whose sum is σ = 246433710. Its totient is φ = 65715648.

The previous prime is 131431283. The next prime is 131431309. The reversal of 131431304 is 403134131.

It can be written as a sum of positive squares in only one way, i.e., 127012900 + 4418404 = 11270^2 + 2102^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×131431304² = 34548375342280832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131431309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8214449 + ... + 8214464.

Almost surely, 2^131431304 is an apocalyptic number.

It is an amenable number.

131431304 is a deficient number, since it is larger than the sum of its proper divisors (115002406).

131431304 is a wasteful number, since it uses less digits than its factorization.

131431304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16428919 (or 16428915 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 131431304 is about 11464.3492619512. The cubic root of 131431304 is about 508.4320729332.

Adding to 131431304 its reverse (403134131), we get a palindrome (534565435).

The spelling of 131431304 in words is "one hundred thirty-one million, four hundred thirty-one thousand, three hundred four".