131995645 has 4 divisors (see below), whose sum is σ = 158394780. Its totient is φ = 105596512.

The previous prime is 131995627. The next prime is 131995657. The reversal of 131995645 is 546599131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546599131 = 13 ⋅42046087.

It can be written as a sum of positive squares in 2 ways, for example, as 15657849 + 116337796 = 3957^2 + 10786^2 .

It is a cyclic number.

It is not a de Polignac number, because 131995645 - 2⁹ = 131995133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13199560 + ... + 13199569.

It is an arithmetic number, because the mean of its divisors is an integer number (39598695).

Almost surely, 2^131995645 is an apocalyptic number.

It is an amenable number.

131995645 is a deficient number, since it is larger than the sum of its proper divisors (26399135).

131995645 is an equidigital number, since it uses as much as digits as its factorization.

131995645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26399134.

The product of its digits is 145800, while the sum is 43.

The square root of 131995645 is about 11488.9357644649. The cubic root of 131995645 is about 509.1587373824.

The spelling of 131995645 in words is "one hundred thirty-one million, nine hundred ninety-five thousand, six hundred forty-five".