31368261851 has 2 divisors, whose sum is σ = 31368261852. Its totient is φ = 31368261850.

The previous prime is 31368261809. The next prime is 31368261877. The reversal of 31368261851 is 15816286313.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31368261851 is a prime.

It is not a weakly prime, because it can be changed into another prime (31362261851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15684130925 + 15684130926.

It is an arithmetic number, because the mean of its divisors is an integer number (15684130926).

Almost surely, 2^31368261851 is an apocalyptic number.

31368261851 is a deficient number, since it is larger than the sum of its proper divisors (1).

31368261851 is an equidigital number, since it uses as much as digits as its factorization.

31368261851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The spelling of 31368261851 in words is "thirty-one billion, three hundred sixty-eight million, two hundred sixty-one thousand, eight hundred fifty-one".