131605438 has 12 divisors (see below), whose sum is σ = 208346040. Its totient is φ = 62339076.

The previous prime is 131605433. The next prime is 131605477. The reversal of 131605438 is 834506131.

It is a super-2 number, since 2×131605438² = 34639982622343688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131605433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90418 + ... + 91861.

It is an arithmetic number, because the mean of its divisors is an integer number (17362170).

Almost surely, 2^131605438 is an apocalyptic number.

131605438 is a deficient number, since it is larger than the sum of its proper divisors (76740602).

131605438 is a wasteful number, since it uses less digits than its factorization.

131605438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182319 (or 182300 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 131605438 is about 11471.9413352754. The cubic root of 131605438 is about 508.6565152499.

The spelling of 131605438 in words is "one hundred thirty-one million, six hundred five thousand, four hundred thirty-eight".