15021688969 has 9 divisors (see below), whose sum is σ = 17475207687. Its totient is φ = 12874998024.

The previous prime is 15021688967. The next prime is 15021688987. The reversal of 15021688969 is 96988612051.

The square root of 15021688969 is 122563.

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., 83960569 + 14937728400 = 9163^2 + 122220^2 .

It is not a de Polignac number, because 15021688969 - 2¹ = 15021688967 is a prime.

It is a super-2 number, since 2×15021688969² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15021688961) 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 8 ways as a sum of consecutive naturals, for example, 849187 + ... + 866695.

It is an arithmetic number, because the mean of its divisors is an integer number (1941689743).

Almost surely, 2^15021688969 is an apocalyptic number.

15021688969 is the 122563-rd square number.

15021688969 is the 61282-nd centered octagonal number.

It is an amenable number.

15021688969 is a deficient number, since it is larger than the sum of its proper divisors (2453518718).

15021688969 is an frugal number, since it uses more digits than its factorization.

15021688969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35032 (or 17516 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 55.

The spelling of 15021688969 in words is "fifteen billion, twenty-one million, six hundred eighty-eight thousand, nine hundred sixty-nine".