51895121039 has 4 divisors (see below), whose sum is σ = 51904598160. Its totient is φ = 51885643920.

The previous prime is 51895121011. The next prime is 51895121063. The reversal of 51895121039 is 93012159815.

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 51895121039 - 2¹² = 51895116943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51895121539) 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, 4730342 + ... + 4741299.

It is an arithmetic number, because the mean of its divisors is an integer number (12976149540).

Almost surely, 2^51895121039 is an apocalyptic number.

51895121039 is a deficient number, since it is larger than the sum of its proper divisors (9477121).

51895121039 is an equidigital number, since it uses as much as digits as its factorization.

51895121039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9477120.

The product of its (nonzero) digits is 97200, while the sum is 44.

The spelling of 51895121039 in words is "fifty-one billion, eight hundred ninety-five million, one hundred twenty-one thousand, thirty-nine".