1150555551 has 4 divisors (see below), whose sum is σ = 1534074072. Its totient is φ = 767037032.

The previous prime is 1150555547. The next prime is 1150555559. The reversal of 1150555551 is 1555550511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1555550511 = 3 ⋅518516837.

It is a cyclic number.

It is not a de Polignac number, because 1150555551 - 2² = 1150555547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1150555559) 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, 191759256 + ... + 191759261.

It is an arithmetic number, because the mean of its divisors is an integer number (383518518).

Almost surely, 2^1150555551 is an apocalyptic number.

1150555551 is a deficient number, since it is larger than the sum of its proper divisors (383518521).

1150555551 is an equidigital number, since it uses as much as digits as its factorization.

1150555551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383518520.

The product of its (nonzero) digits is 15625, while the sum is 33.

The square root of 1150555551 is about 33919.8400792221. The cubic root of 1150555551 is about 1047.8582347014.

The spelling of 1150555551 in words is "one billion, one hundred fifty million, five hundred fifty-five thousand, five hundred fifty-one".