131365649 has 2 divisors, whose sum is σ = 131365650. Its totient is φ = 131365648.

The previous prime is 131365609. The next prime is 131365657. The reversal of 131365649 is 946563131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122323600 + 9042049 = 11060^2 + 3007^2 .

It is a cyclic number.

It is not a de Polignac number, because 131365649 - 2²⁰ = 130317073 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (131365609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65682824 + 65682825.

It is an arithmetic number, because the mean of its divisors is an integer number (65682825).

Almost surely, 2^131365649 is an apocalyptic number.

It is an amenable number.

131365649 is a deficient number, since it is larger than the sum of its proper divisors (1).

131365649 is an equidigital number, since it uses as much as digits as its factorization.

131365649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 38.

The square root of 131365649 is about 11461.4854621903. The cubic root of 131365649 is about 508.3473983627.

The spelling of 131365649 in words is "one hundred thirty-one million, three hundred sixty-five thousand, six hundred forty-nine".