131684478 has 16 divisors (see below), whose sum is σ = 277230720. Its totient is φ = 41584536.

The previous prime is 131684473. The next prime is 131684513. The reversal of 131684478 is 874486131.

It is a super-2 number, since 2×131684478² = 34681603492264968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131684473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 577450 + ... + 577677.

It is an arithmetic number, because the mean of its divisors is an integer number (17326920).

Almost surely, 2^131684478 is an apocalyptic number.

131684478 is an abundant number, since it is smaller than the sum of its proper divisors (145546242).

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

131684478 is a wasteful number, since it uses less digits than its factorization.

131684478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155151.

The product of its digits is 129024, while the sum is 42.

The square root of 131684478 is about 11475.3857451504. The cubic root of 131684478 is about 508.7583250373.

The spelling of 131684478 in words is "one hundred thirty-one million, six hundred eighty-four thousand, four hundred seventy-eight".