1115540551 has 2 divisors, whose sum is σ = 1115540552. Its totient is φ = 1115540550.

The previous prime is 1115540533. The next prime is 1115540557. The reversal of 1115540551 is 1550455111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1115540551 - 2⁵ = 1115540519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1115540557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 557770275 + 557770276.

It is an arithmetic number, because the mean of its divisors is an integer number (557770276).

Almost surely, 2^1115540551 is an apocalyptic number.

1115540551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1115540551 is an equidigital number, since it uses as much as digits as its factorization.

1115540551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2500, while the sum is 28.

The square root of 1115540551 is about 33399.7088460364. The cubic root of 1115540551 is about 1037.1186737404.

Adding to 1115540551 its reverse (1550455111), we get a palindrome (2665995662).

The spelling of 1115540551 in words is "one billion, one hundred fifteen million, five hundred forty thousand, five hundred fifty-one".