1121511251 has 8 divisors (see below), whose sum is σ = 1311535104. Its totient is φ = 938939400.

The previous prime is 1121511197. The next prime is 1121511319. The reversal of 1121511251 is 1521151211.

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

It is a de Polignac number, because none of the positive numbers 2^k-1121511251 is a prime.

It is a super-2 number, since 2×1121511251² = 2515574972239170002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121510251) 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, 1862675 + ... + 1863276.

It is an arithmetic number, because the mean of its divisors is an integer number (163941888).

Almost surely, 2^1121511251 is an apocalyptic number.

1121511251 is a deficient number, since it is larger than the sum of its proper divisors (190023853).

1121511251 is an equidigital number, since it uses as much as digits as its factorization.

1121511251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3726001.

The product of its digits is 100, while the sum is 20.

The square root of 1121511251 is about 33488.9720803730. The cubic root of 1121511251 is about 1038.9657034103.

Adding to 1121511251 its reverse (1521151211), we get a palindrome (2642662462).

The spelling of 1121511251 in words is "one billion, one hundred twenty-one million, five hundred eleven thousand, two hundred fifty-one".