11522123251 has 4 divisors (see below), whose sum is σ = 11651585400. Its totient is φ = 11392661104.

The previous prime is 11522123237. The next prime is 11522123257. The reversal of 11522123251 is 15232122511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15232122511 = 47 ⋅324087713.

It is a cyclic number.

It is not a de Polignac number, because 11522123251 - 2⁹ = 11522122739 is a prime.

It is a super-2 number, since 2×11522123251² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11522123257) 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, 64730941 + ... + 64731118.

It is an arithmetic number, because the mean of its divisors is an integer number (2912896350).

Almost surely, 2^11522123251 is an apocalyptic number.

11522123251 is a deficient number, since it is larger than the sum of its proper divisors (129462149).

11522123251 is an equidigital number, since it uses as much as digits as its factorization.

11522123251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129462148.

The product of its digits is 1200, while the sum is 25.

Adding to 11522123251 its reverse (15232122511), we get a palindrome (26754245762).

The spelling of 11522123251 in words is "eleven billion, five hundred twenty-two million, one hundred twenty-three thousand, two hundred fifty-one".