131383618 has 4 divisors (see below), whose sum is σ = 197075430. Its totient is φ = 65691808.

The previous prime is 131383591. The next prime is 131383621. The reversal of 131383618 is 816383131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 66145689 + 65237929 = 8133^2 + 8077^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32845903 + ... + 32845906.

Almost surely, 2^131383618 is an apocalyptic number.

131383618 is a deficient number, since it is larger than the sum of its proper divisors (65691812).

131383618 is an equidigital number, since it uses as much as digits as its factorization.

131383618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65691811.

The product of its digits is 10368, while the sum is 34.

The square root of 131383618 is about 11462.2693215611. The cubic root of 131383618 is about 508.3705755986.

The spelling of 131383618 in words is "one hundred thirty-one million, three hundred eighty-three thousand, six hundred eighteen".