50997891 has 32 divisors (see below), whose sum is σ = 80994816. Its totient is φ = 27936000.

The previous prime is 50997857. The next prime is 50997901. The reversal of 50997891 is 19879905.

It is not a de Polignac number, because 50997891 - 2⁹ = 50997379 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 50997891.

It is not an unprimeable number, because it can be changed into a prime (50997811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52036 + ... + 53006.

It is an arithmetic number, because the mean of its divisors is an integer number (2531088).

Almost surely, 2^50997891 is an apocalyptic number.

50997891 is a deficient number, since it is larger than the sum of its proper divisors (29996925).

50997891 is a wasteful number, since it uses less digits than its factorization.

50997891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083.

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 50997891 is about 7141.2807674814. The cubic root of 50997891 is about 370.8378650402.

The spelling of 50997891 in words is "fifty million, nine hundred ninety-seven thousand, eight hundred ninety-one".