131609645 has 16 divisors (see below), whose sum is σ = 159600000. Its totient is φ = 104182848.

The previous prime is 131609633. The next prime is 131609651. The reversal of 131609645 is 546906131.

It is a cyclic number.

It is not a de Polignac number, because 131609645 - 2⁶ = 131609581 is a prime.

It is a super-3 number, since 3×131609645³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 347066 + ... + 347444.

It is an arithmetic number, because the mean of its divisors is an integer number (9975000).

Almost surely, 2^131609645 is an apocalyptic number.

It is an amenable number.

131609645 is a deficient number, since it is larger than the sum of its proper divisors (27990355).

131609645 is a wasteful number, since it uses less digits than its factorization.

131609645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 131609645 is about 11472.1246942317. The cubic root of 131609645 is about 508.6619352264.

The spelling of 131609645 in words is "one hundred thirty-one million, six hundred nine thousand, six hundred forty-five".