51331371 has 24 divisors (see below), whose sum is σ = 85743504. Its totient is φ = 27074880.

The previous prime is 51331361. The next prime is 51331391. The reversal of 51331371 is 17313315.

It is not a de Polignac number, because 51331371 - 2⁷ = 51331243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51331351) 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, 11520 + ... + 15341.

It is an arithmetic number, because the mean of its divisors is an integer number (3572646).

Almost surely, 2^51331371 is an apocalyptic number.

51331371 is a deficient number, since it is larger than the sum of its proper divisors (34412133).

51331371 is a wasteful number, since it uses less digits than its factorization.

51331371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26891 (or 26884 counting only the distinct ones).

The product of its digits is 945, while the sum is 24.

The square root of 51331371 is about 7164.5914747458. The cubic root of 51331371 is about 371.6444240768.

Adding to 51331371 its reverse (17313315), we get a palindrome (68644686).

The spelling of 51331371 in words is "fifty-one million, three hundred thirty-one thousand, three hundred seventy-one".