49919395891 has 32 divisors (see below), whose sum is σ = 54314634240. Its totient is φ = 45737467776.

The previous prime is 49919395871. The next prime is 49919395919. The reversal of 49919395891 is 19859391994.

It is a cyclic number.

It is not a de Polignac number, because 49919395891 - 2²⁵ = 49885841459 is a prime.

It is a super-2 number, since 2×49919395891² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49919395871) 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, 73735845 + ... + 73736521.

It is an arithmetic number, because the mean of its divisors is an integer number (1697332320).

Almost surely, 2^49919395891 is an apocalyptic number.

49919395891 is a deficient number, since it is larger than the sum of its proper divisors (4395238349).

49919395891 is a wasteful number, since it uses less digits than its factorization.

49919395891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443.

The product of its digits is 28343520, while the sum is 67.

The spelling of 49919395891 in words is "forty-nine billion, nine hundred nineteen million, three hundred ninety-five thousand, eight hundred ninety-one".