131778356 has 12 divisors (see below), whose sum is σ = 244177668. Its totient is φ = 62013312.

The previous prime is 131778341. The next prime is 131778377. The reversal of 131778356 is 653877131.

It can be written as a sum of positive squares in 2 ways, for example, as 78925456 + 52852900 = 8884^2 + 7270^2 .

It is a super-2 number, since 2×131778356² = 34731070220125472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 968891 + ... + 969026.

It is an arithmetic number, because the mean of its divisors is an integer number (20348139).

Almost surely, 2^131778356 is an apocalyptic number.

It is an amenable number.

131778356 is a deficient number, since it is larger than the sum of its proper divisors (112399312).

131778356 is a wasteful number, since it uses less digits than its factorization.

131778356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937938 (or 1937936 counting only the distinct ones).

The product of its digits is 105840, while the sum is 41.

The square root of 131778356 is about 11479.4754235549. The cubic root of 131778356 is about 508.8791944305.

The spelling of 131778356 in words is "one hundred thirty-one million, seven hundred seventy-eight thousand, three hundred fifty-six".