49128591 has 4 divisors (see below), whose sum is σ = 65504792. Its totient is φ = 32752392.

The previous prime is 49128587. The next prime is 49128617. The reversal of 49128591 is 19582194.

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

It is not a de Polignac number, because 49128591 - 2² = 49128587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49128571) 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, 8188096 + ... + 8188101.

It is an arithmetic number, because the mean of its divisors is an integer number (16376198).

Almost surely, 2^49128591 is an apocalyptic number.

49128591 is a deficient number, since it is larger than the sum of its proper divisors (16376201).

49128591 is a wasteful number, since it uses less digits than its factorization.

49128591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16376200.

The product of its digits is 25920, while the sum is 39.

The square root of 49128591 is about 7009.1790532130. The cubic root of 49128591 is about 366.2503960050.

The spelling of 49128591 in words is "forty-nine million, one hundred twenty-eight thousand, five hundred ninety-one".