23515244251 has 4 divisors (see below), whose sum is σ = 23517003600. Its totient is φ = 23513484904.

The previous prime is 23515244243. The next prime is 23515244261. The reversal of 23515244251 is 15244251532.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23515244251 - 2³ = 23515244243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23515244231) 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, 859471 + ... + 886408.

It is an arithmetic number, because the mean of its divisors is an integer number (5879250900).

Almost surely, 2^23515244251 is an apocalyptic number.

23515244251 is a deficient number, since it is larger than the sum of its proper divisors (1759349).

23515244251 is a wasteful number, since it uses less digits than its factorization.

23515244251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759348.

The product of its digits is 48000, while the sum is 34.

Adding to 23515244251 its reverse (15244251532), we get a palindrome (38759495783).

The spelling of 23515244251 in words is "twenty-three billion, five hundred fifteen million, two hundred forty-four thousand, two hundred fifty-one".