51811371 has 24 divisors (see below), whose sum is σ = 77922000. Its totient is φ = 33133632.

The previous prime is 51811367. The next prime is 51811379. The reversal of 51811371 is 17311815.

It is not a de Polignac number, because 51811371 - 2² = 51811367 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51811379) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46165 + ... + 47273.

It is an arithmetic number, because the mean of its divisors is an integer number (3246750).

Almost surely, 2^51811371 is an apocalyptic number.

51811371 is a deficient number, since it is larger than the sum of its proper divisors (26110629).

51811371 is a wasteful number, since it uses less digits than its factorization.

51811371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323 (or 1320 counting only the distinct ones).

The product of its digits is 840, while the sum is 27.

The square root of 51811371 is about 7198.0116004352. The cubic root of 51811371 is about 372.7992484458.

The spelling of 51811371 in words is "fifty-one million, eight hundred eleven thousand, three hundred seventy-one".