15725497 has 4 divisors (see below), whose sum is σ = 15733476. Its totient is φ = 15717520.

The previous prime is 15725477. The next prime is 15725513. The reversal of 15725497 is 79452751.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79452751 = 7 ⋅11350393.

It can be written as a sum of positive squares in 2 ways, for example, as 7338681 + 8386816 = 2709^2 + 2896^2 .

It is a cyclic number.

It is not a de Polignac number, because 15725497 - 2¹⁹ = 15201209 is a prime.

It is a super-3 number, since 3×15725497³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15725467) 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, 1347 + ... + 5767.

It is an arithmetic number, because the mean of its divisors is an integer number (3933369).

Almost surely, 2^15725497 is an apocalyptic number.

It is an amenable number.

15725497 is a deficient number, since it is larger than the sum of its proper divisors (7979).

15725497 is an equidigital number, since it uses as much as digits as its factorization.

15725497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7978.

The product of its digits is 88200, while the sum is 40.

The square root of 15725497 is about 3965.5386771535. The cubic root of 15725497 is about 250.5348389731.

The spelling of 15725497 in words is "fifteen million, seven hundred twenty-five thousand, four hundred ninety-seven".