45039991 has 2 divisors, whose sum is σ = 45039992. Its totient is φ = 45039990.

The previous prime is 45039977. The next prime is 45040001. The reversal of 45039991 is 19993054.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 45039991 - 2²³ = 36651383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45039941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22519995 + 22519996.

It is an arithmetic number, because the mean of its divisors is an integer number (22519996).

Almost surely, 2^45039991 is an apocalyptic number.

45039991 is a deficient number, since it is larger than the sum of its proper divisors (1).

45039991 is an equidigital number, since it uses as much as digits as its factorization.

45039991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 45039991 is about 6711.1840237025. The cubic root of 45039991 is about 355.7946649706.

The spelling of 45039991 in words is "forty-five million, thirty-nine thousand, nine hundred ninety-one".