131604431 has 8 divisors (see below), whose sum is σ = 158321280. Its totient is φ = 106866648.

The previous prime is 131604409. The next prime is 131604437. The reversal of 131604431 is 134406131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131604431 - 2¹⁴ = 131588047 is a prime.

It is a super-2 number, since 2×131604431² = 34639452517667522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131604397 and 131604406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131604437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 494621 + ... + 494886.

It is an arithmetic number, because the mean of its divisors is an integer number (19790160).

Almost surely, 2^131604431 is an apocalyptic number.

131604431 is a deficient number, since it is larger than the sum of its proper divisors (26716849).

131604431 is an equidigital number, since it uses as much as digits as its factorization.

131604431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989533.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 131604431 is about 11471.8974454970. The cubic root of 131604431 is about 508.6552178911.

The spelling of 131604431 in words is "one hundred thirty-one million, six hundred four thousand, four hundred thirty-one".