1115520251 has 4 divisors (see below), whose sum is σ = 1142728104. Its totient is φ = 1088312400.

The previous prime is 1115520239. The next prime is 1115520269. The reversal of 1115520251 is 1520255111.

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 1115520251 - 2⁶ = 1115520187 is a prime.

It is a super-2 number, since 2×1115520251² = 2488770860782206002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1135520251) 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, 13603865 + ... + 13603946.

It is an arithmetic number, because the mean of its divisors is an integer number (285682026).

Almost surely, 2^1115520251 is an apocalyptic number.

1115520251 is a deficient number, since it is larger than the sum of its proper divisors (27207853).

1115520251 is an equidigital number, since it uses as much as digits as its factorization.

1115520251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27207852.

The product of its (nonzero) digits is 500, while the sum is 23.

The square root of 1115520251 is about 33399.4049497892. The cubic root of 1115520251 is about 1037.1123827285.

Adding to 1115520251 its reverse (1520255111), we get a palindrome (2635775362).

The spelling of 1115520251 in words is "one billion, one hundred fifteen million, five hundred twenty thousand, two hundred fifty-one".