49997891 has 2 divisors, whose sum is σ = 49997892. Its totient is φ = 49997890.

The previous prime is 49997869. The next prime is 49997897. The reversal of 49997891 is 19879994.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 49997891 - 2²² = 45803587 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (49997897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24998945 + 24998946.

It is an arithmetic number, because the mean of its divisors is an integer number (24998946).

Almost surely, 2^49997891 is an apocalyptic number.

49997891 is a deficient number, since it is larger than the sum of its proper divisors (1).

49997891 is an equidigital number, since it uses as much as digits as its factorization.

49997891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 56.

The square root of 49997891 is about 7070.9186814727. The cubic root of 49997891 is about 368.3979700429.

The spelling of 49997891 in words is "forty-nine million, nine hundred ninety-seven thousand, eight hundred ninety-one".