51218479225 has 9 divisors (see below), whose sum is σ = 63512317423. Its totient is φ = 40973878120.

The previous prime is 51218479187. The next prime is 51218479229. The reversal of 51218479225 is 52297481215.

The square root of 51218479225 is 226315.

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., 18438652521 + 32779826704 = 135789^2 + 181052^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51218479225 is a prime.

It is a super-2 number, since 2×51218479225² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51218479229) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1108944 + ... + 1154206.

Almost surely, 2^51218479225 is an apocalyptic number.

51218479225 is the 226315-th square number.

51218479225 is the 113158-th centered octagonal number.

It is an amenable number.

51218479225 is a deficient number, since it is larger than the sum of its proper divisors (12293838198).

51218479225 is an frugal number, since it uses more digits than its factorization.

51218479225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90536 (or 45268 counting only the distinct ones).

The product of its digits is 403200, while the sum is 46.

The spelling of 51218479225 in words is "fifty-one billion, two hundred eighteen million, four hundred seventy-nine thousand, two hundred twenty-five".