131375721 has 16 divisors (see below), whose sum is σ = 177730560. Its totient is φ = 86311680.

The previous prime is 131375689. The next prime is 131375723. The reversal of 131375721 is 127573131.

It is not a de Polignac number, because 131375721 - 2⁵ = 131375689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131375723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63735 + ... + 65763.

It is an arithmetic number, because the mean of its divisors is an integer number (11108160).

Almost surely, 2^131375721 is an apocalyptic number.

It is an amenable number.

131375721 is a deficient number, since it is larger than the sum of its proper divisors (46354839).

131375721 is a wasteful number, since it uses less digits than its factorization.

131375721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2336.

The product of its digits is 4410, while the sum is 30.

The square root of 131375721 is about 11461.9248383507. The cubic root of 131375721 is about 508.3603899481.

The spelling of 131375721 in words is "one hundred thirty-one million, three hundred seventy-five thousand, seven hundred twenty-one".