131395997 has 2 divisors, whose sum is σ = 131395998. Its totient is φ = 131395996.

The previous prime is 131395993. The next prime is 131396047. The reversal of 131395997 is 799593131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84254041 + 47141956 = 9179^2 + 6866^2 .

It is a cyclic number.

It is not a de Polignac number, because 131395997 - 2² = 131395993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131395993) 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, 65697998 + 65697999.

It is an arithmetic number, because the mean of its divisors is an integer number (65697999).

Almost surely, 2^131395997 is an apocalyptic number.

It is an amenable number.

131395997 is a deficient number, since it is larger than the sum of its proper divisors (1).

131395997 is an equidigital number, since it uses as much as digits as its factorization.

131395997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 229635, while the sum is 47.

The square root of 131395997 is about 11462.8092978990. The cubic root of 131395997 is about 508.3865413682.

The spelling of 131395997 in words is "one hundred thirty-one million, three hundred ninety-five thousand, nine hundred ninety-seven".