131217872 has 20 divisors (see below), whose sum is σ = 254479620. Its totient is φ = 65545728.

The previous prime is 131217871. The next prime is 131217881. The reversal of 131217872 is 278712131.

It can be written as a sum of positive squares in 2 ways, for example, as 70627216 + 60590656 = 8404^2 + 7784^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131217871) 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, 16328 + ... + 23000.

It is an arithmetic number, because the mean of its divisors is an integer number (12723981).

Almost surely, 2^131217872 is an apocalyptic number.

It is an amenable number.

131217872 is a deficient number, since it is larger than the sum of its proper divisors (123261748).

131217872 is a wasteful number, since it uses less digits than its factorization.

131217872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7910 (or 7904 counting only the distinct ones).

The product of its digits is 4704, while the sum is 32.

The square root of 131217872 is about 11455.0369706955. The cubic root of 131217872 is about 508.1567086335.

The spelling of 131217872 in words is "one hundred thirty-one million, two hundred seventeen thousand, eight hundred seventy-two".