45190891 has 2 divisors, whose sum is σ = 45190892. Its totient is φ = 45190890.

The previous prime is 45190843. The next prime is 45190909. The reversal of 45190891 is 19809154.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 45190891 - 2¹⁵ = 45158123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 45190891.

It is not a weakly prime, because it can be changed into another prime (45190841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22595445 + 22595446.

It is an arithmetic number, because the mean of its divisors is an integer number (22595446).

Almost surely, 2^45190891 is an apocalyptic number.

45190891 is a deficient number, since it is larger than the sum of its proper divisors (1).

45190891 is an equidigital number, since it uses as much as digits as its factorization.

45190891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 45190891 is about 6722.4170504365. The cubic root of 45190891 is about 356.1915682970.

The spelling of 45190891 in words is "forty-five million, one hundred ninety thousand, eight hundred ninety-one".