11511222251 has 8 divisors (see below), whose sum is σ = 11558514864. Its totient is φ = 11463976800.

The previous prime is 11511222241. The next prime is 11511222263. The reversal of 11511222251 is 15222211511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11511222251 - 2²² = 11507027947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11511222241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 527285 + ... + 548681.

It is an arithmetic number, because the mean of its divisors is an integer number (1444814358).

Almost surely, 2^11511222251 is an apocalyptic number.

11511222251 is a deficient number, since it is larger than the sum of its proper divisors (47292613).

11511222251 is a wasteful number, since it uses less digits than its factorization.

11511222251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23581.

The product of its digits is 400, while the sum is 23.

Adding to 11511222251 its reverse (15222211511), we get a palindrome (26733433762).

The spelling of 11511222251 in words is "eleven billion, five hundred eleven million, two hundred twenty-two thousand, two hundred fifty-one".