15225971 has 4 divisors (see below), whose sum is σ = 15298344. Its totient is φ = 15153600.

The previous prime is 15225943. The next prime is 15225983. The reversal of 15225971 is 17952251.

It is a happy number.

15225971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17952251 = 907 ⋅19793.

It is a cyclic number.

It is not a de Polignac number, because 15225971 - 2¹⁴ = 15209587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15225941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35870 + ... + 36291.

It is an arithmetic number, because the mean of its divisors is an integer number (3824586).

Almost surely, 2^15225971 is an apocalyptic number.

15225971 is a deficient number, since it is larger than the sum of its proper divisors (72373).

15225971 is an equidigital number, since it uses as much as digits as its factorization.

15225971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72372.

The product of its digits is 6300, while the sum is 32.

The square root of 15225971 is about 3902.0470268822. The cubic root of 15225971 is about 247.8534676779.

The spelling of 15225971 in words is "fifteen million, two hundred twenty-five thousand, nine hundred seventy-one".