15213002281 has 3 divisors (see below), whose sum is σ = 15213125623. Its totient is φ = 15212878940.

The previous prime is 15213002269. The next prime is 15213002291. The reversal of 15213002281 is 18220031251.

The square root of 15213002281 is 123341.

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., 14800912281 + 412090000 = 121659^2 + 20300^2 .

It is not a de Polignac number, because 15213002281 - 2⁵ = 15213002249 is a prime.

It is a super-2 number, since 2×15213002281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15213002261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 61671 + ... + 185011.

Almost surely, 2^15213002281 is an apocalyptic number.

15213002281 is the 123341-st square number.

15213002281 is the 61671-st centered octagonal number.

It is an amenable number.

15213002281 is a deficient number, since it is larger than the sum of its proper divisors (123342).

15213002281 is an frugal number, since it uses more digits than its factorization.

15213002281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246682 (or 123341 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

Multiplying 15213002281 by its sum of digits (25), we get a square (380325057025 = 616705²).

The spelling of 15213002281 in words is "fifteen billion, two hundred thirteen million, two thousand, two hundred eighty-one".