49490891 has 2 divisors, whose sum is σ = 49490892. Its totient is φ = 49490890.

The previous prime is 49490887. The next prime is 49490921. The reversal of 49490891 is 19809494.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 49490891 - 2² = 49490887 is a prime.

It is not a weakly prime, because it can be changed into another prime (49490821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24745445 + 24745446.

It is an arithmetic number, because the mean of its divisors is an integer number (24745446).

Almost surely, 2^49490891 is an apocalyptic number.

49490891 is a deficient number, since it is larger than the sum of its proper divisors (1).

49490891 is an equidigital number, since it uses as much as digits as its factorization.

49490891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 49490891 is about 7034.9762615093. The cubic root of 49490891 is about 367.1484994256.

The spelling of 49490891 in words is "forty-nine million, four hundred ninety thousand, eight hundred ninety-one".