15622250121 has 27 divisors (see below), whose sum is σ = 22975100967. Its totient is φ = 10229099760.

The previous prime is 15622250107. The next prime is 15622250153. The reversal of 15622250121 is 12105222651.

The square root of 15622250121 is 124989.

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

15622250121 is a `hidden beast` number, since 1 + 5 + 622 + 25 + 0 + 12 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 508006521 + 15114243600 = 22539^2 + 122940^2 .

It is not a de Polignac number, because 15622250121 - 2⁵ = 15622250089 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (15622250101) 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, 22872646 + ... + 22873328.

Almost surely, 2^15622250121 is an apocalyptic number.

15622250121 is the 124989-th square number.

15622250121 is the 62495-th centered octagonal number.

It is an amenable number.

15622250121 is a deficient number, since it is larger than the sum of its proper divisors (7352850846).

15622250121 is an frugal number, since it uses more digits than its factorization.

15622250121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494 (or 747 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 15622250121 its reverse (12105222651), we get a palindrome (27727472772).

The spelling of 15622250121 in words is "fifteen billion, six hundred twenty-two million, two hundred fifty thousand, one hundred twenty-one".