131499961 has 8 divisors (see below), whose sum is σ = 135589320. Its totient is φ = 127438848.

The previous prime is 131499959. The next prime is 131499983. The reversal of 131499961 is 169994131.

It can be written as a sum of positive squares in 4 ways, for example, as 62094400 + 69405561 = 7880^2 + 8331^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131499961 - 2¹ = 131499959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131499911) 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 in 7 ways as a sum of consecutive naturals, for example, 2595 + ... + 16423.

It is an arithmetic number, because the mean of its divisors is an integer number (16948665).

Almost surely, 2^131499961 is an apocalyptic number.

It is an amenable number.

131499961 is a deficient number, since it is larger than the sum of its proper divisors (4089359).

131499961 is a wasteful number, since it uses less digits than its factorization.

131499961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14123.

The product of its digits is 52488, while the sum is 43.

The square root of 131499961 is about 11467.3432406988. The cubic root of 131499961 is about 508.5205889950.

The spelling of 131499961 in words is "one hundred thirty-one million, four hundred ninety-nine thousand, nine hundred sixty-one".