131505994 has 4 divisors (see below), whose sum is σ = 197258994. Its totient is φ = 65752996.

The previous prime is 131505991. The next prime is 131506013. The reversal of 131505994 is 499505131.

It is a happy number.

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., 131400369 + 105625 = 11463^2 + 325^2 .

It is not an unprimeable number, because it can be changed into a prime (131505991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32876497 + ... + 32876500.

Almost surely, 2^131505994 is an apocalyptic number.

131505994 is a deficient number, since it is larger than the sum of its proper divisors (65753000).

131505994 is an equidigital number, since it uses as much as digits as its factorization.

131505994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65752999.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 131505994 is about 11467.6062890213. The cubic root of 131505994 is about 508.5283655697.

The spelling of 131505994 in words is "one hundred thirty-one million, five hundred five thousand, nine hundred ninety-four".