45457991 has 2 divisors, whose sum is σ = 45457992. Its totient is φ = 45457990.

The previous prime is 45457981. The next prime is 45458003. The reversal of 45457991 is 19975454.

45457991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 45457991 - 2⁶ = 45457927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45457931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22728995 + 22728996.

It is an arithmetic number, because the mean of its divisors is an integer number (22728996).

Almost surely, 2^45457991 is an apocalyptic number.

45457991 is a deficient number, since it is larger than the sum of its proper divisors (1).

45457991 is an equidigital number, since it uses as much as digits as its factorization.

45457991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 44.

The square root of 45457991 is about 6742.2541482801. The cubic root of 45457991 is about 356.8919450039.

The spelling of 45457991 in words is "forty-five million, four hundred fifty-seven thousand, nine hundred ninety-one".