51231153649 has 27 divisors (see below), whose sum is σ = 58068694593. Its totient is φ = 45174441312.

The previous prime is 51231153647. The next prime is 51231153683. The reversal of 51231153649 is 94635113215.

It is a happy number.

The square root of 51231153649 is 226343.

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

It can be written as a sum of positive squares in 4 ways, for example, as 3689712049 + 47541441600 = 60743^2 + 218040^2 .

It is not a de Polignac number, because 51231153649 - 2¹ = 51231153647 is a prime.

It is a super-2 number, since 2×51231153649² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51231153647) 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, 67676179 + ... + 67676935.

Almost surely, 2^51231153649 is an apocalyptic number.

51231153649 is the 226343-rd square number.

51231153649 is the 113172-nd centered octagonal number.

It is an amenable number.

51231153649 is a deficient number, since it is larger than the sum of its proper divisors (6837540944).

51231153649 is an frugal number, since it uses more digits than its factorization.

51231153649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586 (or 793 counting only the distinct ones).

The product of its digits is 97200, while the sum is 40.

The spelling of 51231153649 in words is "fifty-one billion, two hundred thirty-one million, one hundred fifty-three thousand, six hundred forty-nine".