31320200137 has 2 divisors, whose sum is σ = 31320200138. Its totient is φ = 31320200136.

The previous prime is 31320200099. The next prime is 31320200167. The reversal of 31320200137 is 73100202313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29692803856 + 1627396281 = 172316^2 + 40341^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31320200137 is a prime.

It is not a weakly prime, because it can be changed into another prime (31320200167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660100068 + 15660100069.

It is an arithmetic number, because the mean of its divisors is an integer number (15660100069).

Almost surely, 2^31320200137 is an apocalyptic number.

It is an amenable number.

31320200137 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320200137 is an equidigital number, since it uses as much as digits as its factorization.

31320200137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 22.

The spelling of 31320200137 in words is "thirty-one billion, three hundred twenty million, two hundred thousand, one hundred thirty-seven".