131605831 has 8 divisors (see below), whose sum is σ = 150533504. Its totient is φ = 112709880.

The previous prime is 131605811. The next prime is 131605841. The reversal of 131605831 is 138506131.

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

It is a cyclic number.

It is not a de Polignac number, because 131605831 - 2⁷ = 131605703 is a prime.

It is a super-2 number, since 2×131605831² = 34640189506401122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131605831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131605801) 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, 1756 + ... + 16318.

It is an arithmetic number, because the mean of its divisors is an integer number (18816688).

Almost surely, 2^131605831 is an apocalyptic number.

131605831 is a deficient number, since it is larger than the sum of its proper divisors (18927673).

131605831 is a wasteful number, since it uses less digits than its factorization.

131605831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15861.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 131605831 is about 11471.9584640113. The cubic root of 131605831 is about 508.6570215659.

The spelling of 131605831 in words is "one hundred thirty-one million, six hundred five thousand, eight hundred thirty-one".