49138891 has 4 divisors (see below), whose sum is σ = 52029432. Its totient is φ = 46248352.

The previous prime is 49138867. The next prime is 49138907. The reversal of 49138891 is 19883194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 49138891 - 2⁷ = 49138763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49138801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1445245 + ... + 1445278.

It is an arithmetic number, because the mean of its divisors is an integer number (13007358).

Almost surely, 2^49138891 is an apocalyptic number.

49138891 is a deficient number, since it is larger than the sum of its proper divisors (2890541).

49138891 is a wasteful number, since it uses less digits than its factorization.

49138891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890540.

The product of its digits is 62208, while the sum is 43.

The square root of 49138891 is about 7009.9137655181. The cubic root of 49138891 is about 366.2759894893.

The spelling of 49138891 in words is "forty-nine million, one hundred thirty-eight thousand, eight hundred ninety-one".