15231525242 has 4 divisors (see below), whose sum is σ = 22847287866. Its totient is φ = 7615762620.

The previous prime is 15231525233. The next prime is 15231525247. The reversal of 15231525242 is 24252513251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24252513251 = 9187 ⋅2639873.

It can be written as a sum of positive squares in only one way, i.e., 12062848561 + 3168676681 = 109831^2 + 56291^2 .

It is a super-2 number, since 2×15231525242² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15231525199 and 15231525208.

It is not an unprimeable number, because it can be changed into a prime (15231525247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3807881309 + ... + 3807881312.

Almost surely, 2^15231525242 is an apocalyptic number.

15231525242 is a deficient number, since it is larger than the sum of its proper divisors (7615762624).

15231525242 is an equidigital number, since it uses as much as digits as its factorization.

15231525242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7615762623.

The product of its digits is 24000, while the sum is 32.

The spelling of 15231525242 in words is "fifteen billion, two hundred thirty-one million, five hundred twenty-five thousand, two hundred forty-two".