131395993 has 2 divisors, whose sum is σ = 131395994. Its totient is φ = 131395992.

The previous prime is 131395981. The next prime is 131395997. The reversal of 131395993 is 399593131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118984464 + 12411529 = 10908^2 + 3523^2 .

It is a cyclic number.

It is not a de Polignac number, because 131395993 - 2⁵ = 131395961 is a prime.

It is not a weakly prime, because it can be changed into another prime (131395997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65697996 + 65697997.

It is an arithmetic number, because the mean of its divisors is an integer number (65697997).

Almost surely, 2^131395993 is an apocalyptic number.

It is an amenable number.

131395993 is a deficient number, since it is larger than the sum of its proper divisors (1).

131395993 is an equidigital number, since it uses as much as digits as its factorization.

131395993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98415, while the sum is 43.

The square root of 131395993 is about 11462.8091234217. The cubic root of 131395993 is about 508.3865362094.

The spelling of 131395993 in words is "one hundred thirty-one million, three hundred ninety-five thousand, nine hundred ninety-three".