49997091 has 4 divisors (see below), whose sum is σ = 66662792. Its totient is φ = 33331392.

The previous prime is 49997071. The next prime is 49997093. The reversal of 49997091 is 19079994.

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

It is not a de Polignac number, because 49997091 - 2²¹ = 47899939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 49997091.

It is not an unprimeable number, because it can be changed into a prime (49997093) 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, 8332846 + ... + 8332851.

It is an arithmetic number, because the mean of its divisors is an integer number (16665698).

Almost surely, 2^49997091 is an apocalyptic number.

49997091 is a deficient number, since it is larger than the sum of its proper divisors (16665701).

49997091 is a wasteful number, since it uses less digits than its factorization.

49997091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16665700.

The product of its (nonzero) digits is 183708, while the sum is 48.

The square root of 49997091 is about 7070.8621115109. The cubic root of 49997091 is about 368.3960051604.

It can be divided in two parts, 4999 and 7091, that added together give a triangular number (12090 = T₁₅₅).

The spelling of 49997091 in words is "forty-nine million, nine hundred ninety-seven thousand, ninety-one".