31120000091 has 2 divisors, whose sum is σ = 31120000092. Its totient is φ = 31120000090.

The previous prime is 31120000081. The next prime is 31120000123. The reversal of 31120000091 is 19000002113.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19000002113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31120000091 - 2⁶ = 31120000027 is a prime.

It is not a weakly prime, because it can be changed into another prime (31120000061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560000045 + 15560000046.

It is an arithmetic number, because the mean of its divisors is an integer number (15560000046).

Almost surely, 2^31120000091 is an apocalyptic number.

31120000091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31120000091 is an equidigital number, since it uses as much as digits as its factorization.

31120000091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

The spelling of 31120000091 in words is "thirty-one billion, one hundred twenty million, ninety-one", and thus it is an aban number.