51290019729 has 27 divisors (see below), whose sum is σ = 80236668603. Its totient is φ = 31557653712.

The previous prime is 51290019719. The next prime is 51290019763. The reversal of 51290019729 is 92791009215.

The square root of 51290019729 is 226473.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7587281025 + 43702738704 = 87105^2 + 209052^2 .

It is not a de Polignac number, because 51290019729 - 2⁷ = 51290019601 is a prime.

It is a super-2 number, since 2×51290019729² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51290019719) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8829544 + ... + 8835350.

Almost surely, 2^51290019729 is an apocalyptic number.

51290019729 is the 226473-rd square number.

51290019729 is the 113237-th centered octagonal number.

It is an amenable number.

51290019729 is a deficient number, since it is larger than the sum of its proper divisors (28946648874).

51290019729 is an frugal number, since it uses more digits than its factorization.

51290019729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11646 (or 5823 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 45.

The spelling of 51290019729 in words is "fifty-one billion, two hundred ninety million, nineteen thousand, seven hundred twenty-nine".