15423901249 has 3 divisors (see below), whose sum is σ = 15424025443. Its totient is φ = 15423777056.

The previous prime is 15423901237. The next prime is 15423901279. The reversal of 15423901249 is 94210932451.

The square root of 15423901249 is 124193.

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

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: 94210932451 = 19 ⋅4958470129.

It can be written as a sum of positive squares in only one way, i.e., 15280668225 + 143233024 = 123615^2 + 11968^2 .

It is not a de Polignac number, because 15423901249 - 2⁷ = 15423901121 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15423901279) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 62097 + ... + 186289.

Almost surely, 2^15423901249 is an apocalyptic number.

15423901249 is the 124193-rd square number.

15423901249 is the 62097-th centered octagonal number.

It is an amenable number.

15423901249 is a deficient number, since it is larger than the sum of its proper divisors (124194).

15423901249 is an frugal number, since it uses more digits than its factorization.

15423901249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248386 (or 124193 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 15423901249 in words is "fifteen billion, four hundred twenty-three million, nine hundred one thousand, two hundred forty-nine".