1051115551 has 4 divisors (see below), whose sum is σ = 1053624600. Its totient is φ = 1048606504.

The previous prime is 1051115537. The next prime is 1051115581. The reversal of 1051115551 is 1555111501.

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 1051115551 - 2⁵ = 1051115519 is a prime.

It is a super-2 number, since 2×1051115551² = 2209687803108067202, 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 (1051115501) 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, 1253896 + ... + 1254733.

It is an arithmetic number, because the mean of its divisors is an integer number (263406150).

Almost surely, 2^1051115551 is an apocalyptic number.

1051115551 is a deficient number, since it is larger than the sum of its proper divisors (2509049).

1051115551 is an equidigital number, since it uses as much as digits as its factorization.

1051115551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509048.

The product of its (nonzero) digits is 625, while the sum is 25.

The square root of 1051115551 is about 32420.9122481154. The cubic root of 1051115551 is about 1016.7561792487.

It can be divided in two parts, 10511 and 15551, that added together give a palindrome (26062).

The spelling of 1051115551 in words is "one billion, fifty-one million, one hundred fifteen thousand, five hundred fifty-one".