11172397251 has 4 divisors (see below), whose sum is σ = 14896529672. Its totient is φ = 7448264832.

The previous prime is 11172397231. The next prime is 11172397259. The reversal of 11172397251 is 15279327111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15279327111 = 3 ⋅5093109037.

It is not a de Polignac number, because 11172397251 - 2⁵ = 11172397219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11172397259) 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, 1862066206 + ... + 1862066211.

It is an arithmetic number, because the mean of its divisors is an integer number (3724132418).

Almost surely, 2^11172397251 is an apocalyptic number.

11172397251 is a deficient number, since it is larger than the sum of its proper divisors (3724132421).

11172397251 is an equidigital number, since it uses as much as digits as its factorization.

11172397251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3724132420.

The product of its digits is 26460, while the sum is 39.

The spelling of 11172397251 in words is "eleven billion, one hundred seventy-two million, three hundred ninety-seven thousand, two hundred fifty-one".