45951991 has 2 divisors, whose sum is σ = 45951992. Its totient is φ = 45951990.

The previous prime is 45951977. The next prime is 45952001. The reversal of 45951991 is 19915954.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 45951991 - 2¹⁷ = 45820919 is a prime.

It is a super-2 number, since 2×45951991² = 4223170953728162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45951931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22975995 + 22975996.

It is an arithmetic number, because the mean of its divisors is an integer number (22975996).

Almost surely, 2^45951991 is an apocalyptic number.

45951991 is a deficient number, since it is larger than the sum of its proper divisors (1).

45951991 is an equidigital number, since it uses as much as digits as its factorization.

45951991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72900, while the sum is 43.

The square root of 45951991 is about 6778.7897887455. The cubic root of 45951991 is about 358.1800925917.

The spelling of 45951991 in words is "forty-five million, nine hundred fifty-one thousand, nine hundred ninety-one".