52698252721 has 3 divisors (see below), whose sum is σ = 52698482283. Its totient is φ = 52698023160.

The previous prime is 52698252713. The next prime is 52698252751. The reversal of 52698252721 is 12725289625.

The square root of 52698252721 is 229561.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 9700083121 + 42998169600 = 98489^2 + 207360^2 .

It is not a de Polignac number, because 52698252721 - 2³ = 52698252713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52698252751) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 114781 + ... + 344341.

It is an arithmetic number, because the mean of its divisors is an integer number (17566160761).

Almost surely, 2^52698252721 is an apocalyptic number.

52698252721 is the 229561-st square number.

52698252721 is the 114781-st centered octagonal number.

It is an amenable number.

52698252721 is a deficient number, since it is larger than the sum of its proper divisors (229562).

52698252721 is an frugal number, since it uses more digits than its factorization.

52698252721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459122 (or 229561 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 49.

Multiplying 52698252721 by its sum of digits (49), we get a square (2582214383329 = 1606927²).

The spelling of 52698252721 in words is "fifty-two billion, six hundred ninety-eight million, two hundred fifty-two thousand, seven hundred twenty-one".