51085039 has 2 divisors, whose sum is σ = 51085040. Its totient is φ = 51085038.

The previous prime is 51085033. The next prime is 51085061. The reversal of 51085039 is 93058015.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51085039 - 2¹⁷ = 50953967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51085039.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51085033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25542519 + 25542520.

It is an arithmetic number, because the mean of its divisors is an integer number (25542520).

Almost surely, 2^51085039 is an apocalyptic number.

51085039 is a deficient number, since it is larger than the sum of its proper divisors (1).

51085039 is an equidigital number, since it uses as much as digits as its factorization.

51085039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 51085039 is about 7147.3798695746. The cubic root of 51085039 is about 371.0489808745.

The spelling of 51085039 in words is "fifty-one million, eighty-five thousand, thirty-nine".