51513739 has 8 divisors (see below), whose sum is σ = 52738560. Its totient is φ = 50294376.

The previous prime is 51513719. The next prime is 51513743. The reversal of 51513739 is 93731515.

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

It is a cyclic number.

It is not a de Polignac number, because 51513739 - 2⁷ = 51513611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51513719) 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, 22552 + ... + 24730.

It is an arithmetic number, because the mean of its divisors is an integer number (6592320).

Almost surely, 2^51513739 is an apocalyptic number.

51513739 is a deficient number, since it is larger than the sum of its proper divisors (1224821).

51513739 is a wasteful number, since it uses less digits than its factorization.

51513739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2729.

The product of its digits is 14175, while the sum is 34.

The square root of 51513739 is about 7177.3072248581. The cubic root of 51513739 is about 372.0840249360.

The spelling of 51513739 in words is "fifty-one million, five hundred thirteen thousand, seven hundred thirty-nine".