131921915 has 8 divisors (see below), whose sum is σ = 158550480. Its totient is φ = 105374752.

The previous prime is 131921897. The next prime is 131921917. The reversal of 131921915 is 519129131.

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

It is a cyclic number.

It is not a de Polignac number, because 131921915 - 2⁶ = 131921851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131921917) 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, 16724 + ... + 23313.

It is an arithmetic number, because the mean of its divisors is an integer number (19818810).

Almost surely, 2^131921915 is an apocalyptic number.

131921915 is a deficient number, since it is larger than the sum of its proper divisors (26628565).

131921915 is an equidigital number, since it uses as much as digits as its factorization.

131921915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40701.

The product of its digits is 2430, while the sum is 32.

The square root of 131921915 is about 11485.7265769302. The cubic root of 131921915 is about 509.0639179268.

The spelling of 131921915 in words is "one hundred thirty-one million, nine hundred twenty-one thousand, nine hundred fifteen".