51138351 has 32 divisors (see below), whose sum is σ = 83389440. Its totient is φ = 30971160.

The previous prime is 51138349. The next prime is 51138377. The reversal of 51138351 is 15383115.

It is not a de Polignac number, because 51138351 - 2¹ = 51138349 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51138301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35226 + ... + 36648.

It is an arithmetic number, because the mean of its divisors is an integer number (2605920).

Almost surely, 2^51138351 is an apocalyptic number.

51138351 is a deficient number, since it is larger than the sum of its proper divisors (32251089).

51138351 is a wasteful number, since it uses less digits than its factorization.

51138351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465 (or 1437 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 51138351 is about 7151.1083756296. The cubic root of 51138351 is about 371.1780107328.

The spelling of 51138351 in words is "fifty-one million, one hundred thirty-eight thousand, three hundred fifty-one".