311020091 has 2 divisors, whose sum is σ = 311020092. Its totient is φ = 311020090.

The previous prime is 311020081. The next prime is 311020109. The reversal of 311020091 is 190020113.

It is a happy number.

Together with next prime (311020109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (190020113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311020091 - 2⁶ = 311020027 is a prime.

It is not a weakly prime, because it can be changed into another prime (311020081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155510045 + 155510046.

It is an arithmetic number, because the mean of its divisors is an integer number (155510046).

Almost surely, 2^311020091 is an apocalyptic number.

311020091 is a deficient number, since it is larger than the sum of its proper divisors (1).

311020091 is an equidigital number, since it uses as much as digits as its factorization.

311020091 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 square root of 311020091 is about 17635.7617073944. The cubic root of 311020091 is about 677.5314844008.

The spelling of 311020091 in words is "three hundred eleven million, twenty thousand, ninety-one".