131899581 has 12 divisors (see below), whose sum is σ = 207841920. Its totient is φ = 79939080.

The previous prime is 131899571. The next prime is 131899601. The reversal of 131899581 is 185998131.

It is not a de Polignac number, because 131899581 - 2⁹ = 131899069 is a prime.

It is a super-2 number, since 2×131899581² = 34794998935951122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131899571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 666061 + ... + 666258.

It is an arithmetic number, because the mean of its divisors is an integer number (17320160).

Almost surely, 2^131899581 is an apocalyptic number.

131899581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131899581 is a deficient number, since it is larger than the sum of its proper divisors (75942339).

131899581 is a wasteful number, since it uses less digits than its factorization.

131899581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332336 (or 1332333 counting only the distinct ones).

The product of its digits is 77760, while the sum is 45.

The square root of 131899581 is about 11484.7542855735. The cubic root of 131899581 is about 509.0351886208.

The spelling of 131899581 in words is "one hundred thirty-one million, eight hundred ninety-nine thousand, five hundred eighty-one".