131888819 has 4 divisors (see below), whose sum is σ = 133746480. Its totient is φ = 130031160.

The previous prime is 131888807. The next prime is 131888821. The reversal of 131888819 is 918888131.

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

It is a cyclic number.

It is not a de Polignac number, because 131888819 - 2⁴ = 131888803 is a prime.

It is a super-2 number, since 2×131888819² = 34789321154429522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131888879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 928724 + ... + 928865.

It is an arithmetic number, because the mean of its divisors is an integer number (33436620).

Almost surely, 2^131888819 is an apocalyptic number.

131888819 is a deficient number, since it is larger than the sum of its proper divisors (1857661).

131888819 is an equidigital number, since it uses as much as digits as its factorization.

131888819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857660.

The product of its digits is 110592, while the sum is 47.

The square root of 131888819 is about 11484.2857418300. The cubic root of 131888819 is about 509.0213437810.

The spelling of 131888819 in words is "one hundred thirty-one million, eight hundred eighty-eight thousand, eight hundred nineteen".