131888881 has 4 divisors (see below), whose sum is σ = 133695652. Its totient is φ = 130082112.

The previous prime is 131888879. The next prime is 131888903. The reversal of 131888881 is 188888131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 114383025 + 17505856 = 10695^2 + 4184^2 .

It is a cyclic number.

It is not a de Polignac number, because 131888881 - 2¹ = 131888879 is a prime.

It is a super-2 number, since 2×131888881² = 34789353862864322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131888821) 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, 903276 + ... + 903421.

It is an arithmetic number, because the mean of its divisors is an integer number (33423913).

Almost surely, 2^131888881 is an apocalyptic number.

It is an amenable number.

131888881 is a deficient number, since it is larger than the sum of its proper divisors (1806771).

131888881 is an equidigital number, since it uses as much as digits as its factorization.

131888881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1806770.

The product of its digits is 98304, while the sum is 46.

The square root of 131888881 is about 11484.2884411704. The cubic root of 131888881 is about 509.0214235434.

The spelling of 131888881 in words is "one hundred thirty-one million, eight hundred eighty-eight thousand, eight hundred eighty-one".