1155501225 has 36 divisors (see below), whose sum is σ = 2071621500. Its totient is φ = 615674880.

The previous prime is 1155501173. The next prime is 1155501227. The reversal of 1155501225 is 5221055511.

1155501225 is a `hidden beast` number, since 1 + 155 + 501 + 2 + 2 + 5 = 666.

1155501225 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 423906921 + 731594304 = 20589^2 + 27048^2 .

It is not a de Polignac number, because 1155501225 - 2⁷ = 1155501097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1155501227) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 333301 + ... + 336749.

Almost surely, 2^1155501225 is an apocalyptic number.

1155501225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1155501225 is a deficient number, since it is larger than the sum of its proper divisors (916120275).

1155501225 is a wasteful number, since it uses less digits than its factorization.

1155501225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4954 (or 4946 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

The square root of 1155501225 is about 33992.6642821654. The cubic root of 1155501225 is about 1049.3574980855.

Adding to 1155501225 its reverse (5221055511), we get a palindrome (6376556736).

The spelling of 1155501225 in words is "one billion, one hundred fifty-five million, five hundred one thousand, two hundred twenty-five".