51520911 has 16 divisors (see below), whose sum is σ = 74274816. Its totient is φ = 31578336.

The previous prime is 51520891. The next prime is 51520927. The reversal of 51520911 is 11902515.

It is not a de Polignac number, because 51520911 - 2¹³ = 51512719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7746 + ... + 12768.

It is an arithmetic number, because the mean of its divisors is an integer number (4642176).

Almost surely, 2^51520911 is an apocalyptic number.

51520911 is a deficient number, since it is larger than the sum of its proper divisors (22753905).

51520911 is a wasteful number, since it uses less digits than its factorization.

51520911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5302.

The product of its (nonzero) digits is 450, while the sum is 24.

The square root of 51520911 is about 7177.8068377465. The cubic root of 51520911 is about 372.1012919334.

The spelling of 51520911 in words is "fifty-one million, five hundred twenty thousand, nine hundred eleven".