131138778 has 16 divisors (see below), whose sum is σ = 273681216. Its totient is φ = 41812320.

The previous prime is 131138771. The next prime is 131138851. The reversal of 131138778 is 877831131.

It is not an unprimeable number, because it can be changed into a prime (131138771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 475003 + ... + 475278.

It is an arithmetic number, because the mean of its divisors is an integer number (17105076).

Almost surely, 2^131138778 is an apocalyptic number.

131138778 is an abundant number, since it is smaller than the sum of its proper divisors (142542438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131138778 is a wasteful number, since it uses less digits than its factorization.

131138778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950309.

The product of its digits is 28224, while the sum is 39.

The square root of 131138778 is about 11451.5840825626. The cubic root of 131138778 is about 508.0545878265.

The spelling of 131138778 in words is "one hundred thirty-one million, one hundred thirty-eight thousand, seven hundred seventy-eight".