131395645 has 4 divisors (see below), whose sum is σ = 157674780. Its totient is φ = 105116512.

The previous prime is 131395637. The next prime is 131395657. The reversal of 131395645 is 546593131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34786404 + 96609241 = 5898^2 + 9829^2 .

It is a cyclic number.

It is not a de Polignac number, because 131395645 - 2³ = 131395637 is a prime.

It is a super-4 number, since 4×131395645⁴ (a number of 34 digits) contains 4444 as substring.

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, 13139560 + ... + 13139569.

It is an arithmetic number, because the mean of its divisors is an integer number (39418695).

Almost surely, 2^131395645 is an apocalyptic number.

It is an amenable number.

131395645 is a deficient number, since it is larger than the sum of its proper divisors (26279135).

131395645 is an equidigital number, since it uses as much as digits as its factorization.

131395645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26279134.

The product of its digits is 48600, while the sum is 37.

The square root of 131395645 is about 11462.7939438865. The cubic root of 131395645 is about 508.3860873914.

The spelling of 131395645 in words is "one hundred thirty-one million, three hundred ninety-five thousand, six hundred forty-five".