131147993 has 2 divisors, whose sum is σ = 131147994. Its totient is φ = 131147992.

The previous prime is 131147983. The next prime is 131148067. The reversal of 131147993 is 399741131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87759424 + 43388569 = 9368^2 + 6587^2 .

It is an emirp because it is prime and its reverse (399741131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131147993 - 2¹⁸ = 130885849 is a prime.

It is not a weakly prime, because it can be changed into another prime (131147903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65573996 + 65573997.

It is an arithmetic number, because the mean of its divisors is an integer number (65573997).

Almost surely, 2^131147993 is an apocalyptic number.

It is an amenable number.

131147993 is a deficient number, since it is larger than the sum of its proper divisors (1).

131147993 is an equidigital number, since it uses as much as digits as its factorization.

131147993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 38.

The square root of 131147993 is about 11451.9864215777. The cubic root of 131147993 is about 508.0664877223.

The spelling of 131147993 in words is "one hundred thirty-one million, one hundred forty-seven thousand, nine hundred ninety-three".