51293139 has 4 divisors (see below), whose sum is σ = 68390856. Its totient is φ = 34195424.

The previous prime is 51293129. The next prime is 51293149. The reversal of 51293139 is 93139215.

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

It is an interprime number because it is at equal distance from previous prime (51293129) and next prime (51293149).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51293139 is a prime.

It is a super-2 number, since 2×51293139² = 5261972216946642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51293119) 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, 8548854 + ... + 8548859.

It is an arithmetic number, because the mean of its divisors is an integer number (17097714).

Almost surely, 2^51293139 is an apocalyptic number.

51293139 is a deficient number, since it is larger than the sum of its proper divisors (17097717).

51293139 is a wasteful number, since it uses less digits than its factorization.

51293139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17097716.

The product of its digits is 7290, while the sum is 33.

The square root of 51293139 is about 7161.9228563285. The cubic root of 51293139 is about 371.5521332847.

The spelling of 51293139 in words is "fifty-one million, two hundred ninety-three thousand, one hundred thirty-nine".