51209427025 has 9 divisors (see below), whose sum is σ = 63501092571. Its totient is φ = 40966636440.

The previous prime is 51209426999. The next prime is 51209427041. The reversal of 51209427025 is 52072490215.

The square root of 51209427025 is 226295.

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

51209427025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 18435393729 + 32774033296 = 135777^2 + 181036^2 .

It is not a de Polignac number, because 51209427025 - 2¹¹ = 51209424977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1108846 + ... + 1154104.

Almost surely, 2^51209427025 is an apocalyptic number.

51209427025 is the 226295-th square number.

51209427025 is the 113148-th centered octagonal number.

It is an amenable number.

51209427025 is a deficient number, since it is larger than the sum of its proper divisors (12291665546).

51209427025 is an frugal number, since it uses more digits than its factorization.

51209427025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90528 (or 45264 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 51209427025 in words is "fifty-one billion, two hundred nine million, four hundred twenty-seven thousand, twenty-five".