131720169 has 16 divisors (see below), whose sum is σ = 202050560. Its totient is φ = 74768400.

The previous prime is 131720161. The next prime is 131720189. The reversal of 131720169 is 961027131.

It is not a de Polignac number, because 131720169 - 2³ = 131720161 is a prime.

It is a super-2 number, since 2×131720169² = 34700405842777122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131720161) 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, 17599 + ... + 23940.

It is an arithmetic number, because the mean of its divisors is an integer number (12628160).

Almost surely, 2^131720169 is an apocalyptic number.

It is an amenable number.

131720169 is a deficient number, since it is larger than the sum of its proper divisors (70330391).

131720169 is a wasteful number, since it uses less digits than its factorization.

131720169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41700.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 131720169 is about 11476.9407509144. The cubic root of 131720169 is about 508.8042845242.

The spelling of 131720169 in words is "one hundred thirty-one million, seven hundred twenty thousand, one hundred sixty-nine".