131205988 has 6 divisors (see below), whose sum is σ = 229610486. Its totient is φ = 65602992.

The previous prime is 131205979. The next prime is 131205989. The reversal of 131205988 is 889502131.

It can be written as a sum of positive squares in only one way, i.e., 107702884 + 23503104 = 10378^2 + 4848^2 .

It is a super-2 number, since 2×131205988² = 34430022574112288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131205989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16400745 + ... + 16400752.

Almost surely, 2^131205988 is an apocalyptic number.

It is an amenable number.

131205988 is a deficient number, since it is larger than the sum of its proper divisors (98404498).

131205988 is a wasteful number, since it uses less digits than its factorization.

131205988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32801501 (or 32801499 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 131205988 is about 11454.5182351769. The cubic root of 131205988 is about 508.1413674391.

The spelling of 131205988 in words is "one hundred thirty-one million, two hundred five thousand, nine hundred eighty-eight".