1155125553 has 8 divisors (see below), whose sum is σ = 1542682368. Its totient is φ = 768826224.

The previous prime is 1155125509. The next prime is 1155125591. The reversal of 1155125553 is 3555215511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1155125553 - 2¹³ = 1155117361 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1155125053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312225 + ... + 315902.

It is an arithmetic number, because the mean of its divisors is an integer number (192835296).

Almost surely, 2^1155125553 is an apocalyptic number.

It is an amenable number.

1155125553 is a deficient number, since it is larger than the sum of its proper divisors (387556815).

1155125553 is an equidigital number, since it uses as much as digits as its factorization.

1155125553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628743.

The product of its digits is 18750, while the sum is 33.

The square root of 1155125553 is about 33987.1380525045. The cubic root of 1155125553 is about 1049.2437647690.

The spelling of 1155125553 in words is "one billion, one hundred fifty-five million, one hundred twenty-five thousand, five hundred fifty-three".