45312991 has 2 divisors, whose sum is σ = 45312992. Its totient is φ = 45312990.

The previous prime is 45312989. The next prime is 45313019. The reversal of 45312991 is 19921354.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 45312991 - 2¹ = 45312989 is a prime.

Together with 45312989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45312961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22656495 + 22656496.

It is an arithmetic number, because the mean of its divisors is an integer number (22656496).

Almost surely, 2^45312991 is an apocalyptic number.

45312991 is a deficient number, since it is larger than the sum of its proper divisors (1).

45312991 is an equidigital number, since it uses as much as digits as its factorization.

45312991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 34.

The square root of 45312991 is about 6731.4924793838. The cubic root of 45312991 is about 356.5120744815.

The spelling of 45312991 in words is "forty-five million, three hundred twelve thousand, nine hundred ninety-one".