1111112551 has 4 divisors (see below), whose sum is σ = 1111918504. Its totient is φ = 1110306600.

The previous prime is 1111112531. The next prime is 1111112557. The reversal of 1111112551 is 1552111111.

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 1111112551 - 2¹³ = 1111104359 is a prime.

It is a super-2 number, since 2×1111112551² = 2469142201979455202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111112557) 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, 400905 + ... + 403666.

It is an arithmetic number, because the mean of its divisors is an integer number (277979626).

Almost surely, 2^1111112551 is an apocalyptic number.

1111112551 is a deficient number, since it is larger than the sum of its proper divisors (805953).

1111112551 is an equidigital number, since it uses as much as digits as its factorization.

1111112551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805952.

The product of its digits is 50, while the sum is 19.

The square root of 1111112551 is about 33333.3549316597. The cubic root of 1111112551 is about 1035.7446160580.

Adding to 1111112551 its reverse (1552111111), we get a palindrome (2663223662).

The spelling of 1111112551 in words is "one billion, one hundred eleven million, one hundred twelve thousand, five hundred fifty-one".