131605031 has 4 divisors (see below), whose sum is σ = 131628552. Its totient is φ = 131581512.

The previous prime is 131605027. The next prime is 131605051. The reversal of 131605031 is 130506131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130506131 = 7 ⋅18643733.

It is a cyclic number.

It is not a de Polignac number, because 131605031 - 2² = 131605027 is a prime.

It is a super-2 number, since 2×131605031² = 34639768369021922, 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 = 131604994 and 131605012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131605051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000 + ... + 16346.

It is an arithmetic number, because the mean of its divisors is an integer number (32907138).

Almost surely, 2^131605031 is an apocalyptic number.

131605031 is a deficient number, since it is larger than the sum of its proper divisors (23521).

131605031 is an equidigital number, since it uses as much as digits as its factorization.

131605031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23520.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 131605031 is about 11471.9235963286. The cubic root of 131605031 is about 508.6559908961.

The spelling of 131605031 in words is "one hundred thirty-one million, six hundred five thousand, thirty-one".