51130391 has 8 divisors (see below), whose sum is σ = 55120800. Its totient is φ = 47148192.

The previous prime is 51130381. The next prime is 51130421. The reversal of 51130391 is 19303115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-51130391 is a prime.

It is a super-2 number, since 2×51130391² = 5228633767625762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51130351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18785 + ... + 21333.

It is an arithmetic number, because the mean of its divisors is an integer number (6890100).

Almost surely, 2^51130391 is an apocalyptic number.

51130391 is a deficient number, since it is larger than the sum of its proper divisors (3990409).

51130391 is a wasteful number, since it uses less digits than its factorization.

51130391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105.

The product of its (nonzero) digits is 405, while the sum is 23.

The square root of 51130391 is about 7150.5517968895. The cubic root of 51130391 is about 371.1587510173.

The spelling of 51130391 in words is "fifty-one million, one hundred thirty thousand, three hundred ninety-one".