31277874091 has 2 divisors, whose sum is σ = 31277874092. Its totient is φ = 31277874090.

The previous prime is 31277874077. The next prime is 31277874149. The reversal of 31277874091 is 19047877213.

It is a weak prime.

It is an emirp because it is prime and its reverse (19047877213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31277874091 is a prime.

It is not a weakly prime, because it can be changed into another prime (31277874011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15638937045 + 15638937046.

It is an arithmetic number, because the mean of its divisors is an integer number (15638937046).

Almost surely, 2^31277874091 is an apocalyptic number.

31277874091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31277874091 is an equidigital number, since it uses as much as digits as its factorization.

31277874091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 592704, while the sum is 49.

The spelling of 31277874091 in words is "thirty-one billion, two hundred seventy-seven million, eight hundred seventy-four thousand, ninety-one".