1115542551 has 4 divisors (see below), whose sum is σ = 1487390072. Its totient is φ = 743695032.

The previous prime is 1115542537. The next prime is 1115542577. The reversal of 1115542551 is 1552455111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1552455111 = 3 ⋅517485037.

It is not a de Polignac number, because 1115542551 - 2²⁵ = 1081988119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115542511) 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, 185923756 + ... + 185923761.

It is an arithmetic number, because the mean of its divisors is an integer number (371847518).

Almost surely, 2^1115542551 is an apocalyptic number.

1115542551 is a deficient number, since it is larger than the sum of its proper divisors (371847521).

1115542551 is an equidigital number, since it uses as much as digits as its factorization.

1115542551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371847520.

The product of its digits is 5000, while the sum is 30.

The square root of 1115542551 is about 33399.7387864037. The cubic root of 1115542551 is about 1037.1192935404.

Adding to 1115542551 its reverse (1552455111), we get a palindrome (2667997662).

The spelling of 1115542551 in words is "one billion, one hundred fifteen million, five hundred forty-two thousand, five hundred fifty-one".