131922478 has 4 divisors (see below), whose sum is σ = 197883720. Its totient is φ = 65961238.

The previous prime is 131922451. The next prime is 131922481. The reversal of 131922478 is 874229131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 874229131 = 17 ⋅51425243.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32980618 + ... + 32980621.

It is an arithmetic number, because the mean of its divisors is an integer number (49470930).

Almost surely, 2^131922478 is an apocalyptic number.

131922478 is a deficient number, since it is larger than the sum of its proper divisors (65961242).

131922478 is an equidigital number, since it uses as much as digits as its factorization.

131922478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65961241.

The product of its digits is 24192, while the sum is 37.

The square root of 131922478 is about 11485.7510855843. The cubic root of 131922478 is about 509.0646420991.

The spelling of 131922478 in words is "one hundred thirty-one million, nine hundred twenty-two thousand, four hundred seventy-eight".