131609739 has 4 divisors (see below), whose sum is σ = 175479656. Its totient is φ = 87739824.

The previous prime is 131609701. The next prime is 131609741. The reversal of 131609739 is 937906131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 937906131 = 3 ⋅312635377.

It is not a de Polignac number, because 131609739 - 2⁸ = 131609483 is a prime.

It is a super-2 number, since 2×131609739² = 34642246799296242, 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 = 131609697 and 131609706.

It is not an unprimeable number, because it can be changed into a prime (131609039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21934954 + ... + 21934959.

It is an arithmetic number, because the mean of its divisors is an integer number (43869914).

Almost surely, 2^131609739 is an apocalyptic number.

131609739 is a deficient number, since it is larger than the sum of its proper divisors (43869917).

131609739 is an equidigital number, since it uses as much as digits as its factorization.

131609739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43869916.

The product of its (nonzero) digits is 30618, while the sum is 39.

The square root of 131609739 is about 11472.1287911181. The cubic root of 131609739 is about 508.6620563275.

The spelling of 131609739 in words is "one hundred thirty-one million, six hundred nine thousand, seven hundred thirty-nine".