131009945 has 8 divisors (see below), whose sum is σ = 171504000. Its totient is φ = 95279920.

The previous prime is 131009941. The next prime is 131009951. The reversal of 131009945 is 549900131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131009945 - 2² = 131009941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131009941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1190945 + ... + 1191054.

It is an arithmetic number, because the mean of its divisors is an integer number (21438000).

Almost surely, 2^131009945 is an apocalyptic number.

It is an amenable number.

131009945 is a deficient number, since it is larger than the sum of its proper divisors (40494055).

131009945 is a wasteful number, since it uses less digits than its factorization.

131009945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382015.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 131009945 is about 11445.9575833567. The cubic root of 131009945 is about 507.8881594472. Note that the first 3 decimals are identical.

The spelling of 131009945 in words is "one hundred thirty-one million, nine thousand, nine hundred forty-five".