51465913321 has 9 divisors (see below), whose sum is σ = 52071107461. Its totient is φ = 50867680864.

The previous prime is 51465913307. The next prime is 51465913379. The reversal of 51465913321 is 12331956415.

It is a happy number.

The square root of 51465913321 is 226861.

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 1567288921 + 49898624400 = 39589^2 + 223380^2 .

It is not a de Polignac number, because 51465913321 - 2⁷ = 51465913193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51465913381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20189355 + ... + 20191903.

Almost surely, 2^51465913321 is an apocalyptic number.

51465913321 is the 226861-st square number.

51465913321 is the 113431-st centered octagonal number.

It is an amenable number.

51465913321 is a deficient number, since it is larger than the sum of its proper divisors (605194140).

51465913321 is an frugal number, since it uses more digits than its factorization.

51465913321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5276 (or 2638 counting only the distinct ones).

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

The spelling of 51465913321 in words is "fifty-one billion, four hundred sixty-five million, nine hundred thirteen thousand, three hundred twenty-one".