31309149247 has 2 divisors, whose sum is σ = 31309149248. Its totient is φ = 31309149246.

The previous prime is 31309149187. The next prime is 31309149253. The reversal of 31309149247 is 74294190313.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31309149247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31309179247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15654574623 + 15654574624.

It is an arithmetic number, because the mean of its divisors is an integer number (15654574624).

Almost surely, 2^31309149247 is an apocalyptic number.

31309149247 is a deficient number, since it is larger than the sum of its proper divisors (1).

31309149247 is an equidigital number, since it uses as much as digits as its factorization.

31309149247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 43.

The spelling of 31309149247 in words is "thirty-one billion, three hundred nine million, one hundred forty-nine thousand, two hundred forty-seven".