131121878 has 32 divisors (see below), whose sum is σ = 209848320. Its totient is φ = 61346880.

The previous prime is 131121871. The next prime is 131121883. The reversal of 131121878 is 878121131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131121871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365063 + ... + 365421.

It is an arithmetic number, because the mean of its divisors is an integer number (6557760).

Almost surely, 2^131121878 is an apocalyptic number.

131121878 is a deficient number, since it is larger than the sum of its proper divisors (78726442).

131121878 is a wasteful number, since it uses less digits than its factorization.

131121878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572.

The product of its digits is 2688, while the sum is 32.

The square root of 131121878 is about 11450.8461696069. The cubic root of 131121878 is about 508.0327623692.

The spelling of 131121878 in words is "one hundred thirty-one million, one hundred twenty-one thousand, eight hundred seventy-eight".