50921591 has 4 divisors (see below), whose sum is σ = 58196112. Its totient is φ = 43647072.

The previous prime is 50921581. The next prime is 50921597. The reversal of 50921591 is 19512905.

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

It is not a de Polignac number, because 50921591 - 2⁶ = 50921527 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 (50921597) 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, 3637250 + ... + 3637263.

It is an arithmetic number, because the mean of its divisors is an integer number (14549028).

Almost surely, 2^50921591 is an apocalyptic number.

50921591 is a deficient number, since it is larger than the sum of its proper divisors (7274521).

50921591 is an equidigital number, since it uses as much as digits as its factorization.

50921591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7274520.

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 50921591 is about 7135.9365888438. The cubic root of 50921591 is about 370.6528309055.

The spelling of 50921591 in words is "fifty million, nine hundred twenty-one thousand, five hundred ninety-one".