131664009 has 4 divisors (see below), whose sum is σ = 175552016. Its totient is φ = 87776004.

The previous prime is 131663993. The next prime is 131664059. The reversal of 131664009 is 900466131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 131664009 - 2⁴ = 131663993 is a prime.

It is a super-2 number, since 2×131664009² = 34670822531904162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131664059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21943999 + ... + 21944004.

It is an arithmetic number, because the mean of its divisors is an integer number (43888004).

Almost surely, 2^131664009 is an apocalyptic number.

It is an amenable number.

131664009 is a deficient number, since it is larger than the sum of its proper divisors (43888007).

131664009 is an equidigital number, since it uses as much as digits as its factorization.

131664009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43888006.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 131664009 is about 11474.4938450461. The cubic root of 131664009 is about 508.7319632521.

The spelling of 131664009 in words is "one hundred thirty-one million, six hundred sixty-four thousand, nine".