51357139 has 4 divisors (see below), whose sum is σ = 51855856. Its totient is φ = 50858424.

The previous prime is 51357113. The next prime is 51357157. The reversal of 51357139 is 93175315.

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

It is a cyclic number.

It is not a de Polignac number, because 51357139 - 2⁷ = 51357011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51357169) 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, 249204 + ... + 249409.

It is an arithmetic number, because the mean of its divisors is an integer number (12963964).

Almost surely, 2^51357139 is an apocalyptic number.

51357139 is a deficient number, since it is larger than the sum of its proper divisors (498717).

51357139 is a wasteful number, since it uses less digits than its factorization.

51357139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498716.

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

The square root of 51357139 is about 7166.3895372775. The cubic root of 51357139 is about 371.7066013337.

The spelling of 51357139 in words is "fifty-one million, three hundred fifty-seven thousand, one hundred thirty-nine".