44857991 has 2 divisors, whose sum is σ = 44857992. Its totient is φ = 44857990.

The previous prime is 44857979. The next prime is 44857999. The reversal of 44857991 is 19975844.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 44857991 - 2⁶ = 44857927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44857999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22428995 + 22428996.

It is an arithmetic number, because the mean of its divisors is an integer number (22428996).

Almost surely, 2^44857991 is an apocalyptic number.

44857991 is a deficient number, since it is larger than the sum of its proper divisors (1).

44857991 is an equidigital number, since it uses as much as digits as its factorization.

44857991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 44857991 is about 6697.6108426811. The cubic root of 44857991 is about 355.3147799822.

The spelling of 44857991 in words is "forty-four million, eight hundred fifty-seven thousand, nine hundred ninety-one".