45172991 has 2 divisors, whose sum is σ = 45172992. Its totient is φ = 45172990.

The previous prime is 45172949. The next prime is 45173003. The reversal of 45172991 is 19927154.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 45172991 - 2¹⁰ = 45171967 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45172931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22586495 + 22586496.

It is an arithmetic number, because the mean of its divisors is an integer number (22586496).

Almost surely, 2^45172991 is an apocalyptic number.

45172991 is a deficient number, since it is larger than the sum of its proper divisors (1).

45172991 is an equidigital number, since it uses as much as digits as its factorization.

45172991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 38.

The square root of 45172991 is about 6721.0855522006. The cubic root of 45172991 is about 356.1445332203.

The spelling of 45172991 in words is "forty-five million, one hundred seventy-two thousand, nine hundred ninety-one".