1155172158 has 96 divisors (see below), whose sum is σ = 3082705920. Its totient is φ = 319379760.

The previous prime is 1155172147. The next prime is 1155172169. The reversal of 1155172158 is 8512715511.

1155172158 is a `hidden beast` number, since 115 + 517 + 21 + 5 + 8 = 666.

1155172158 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1155172147) and next prime (1155172169).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 74985 + ... + 89067.

It is an arithmetic number, because the mean of its divisors is an integer number (32111520).

Almost surely, 2^1155172158 is an apocalyptic number.

1155172158 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1155172158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1541352960).

1155172158 is an abundant number, since it is smaller than the sum of its proper divisors (1927533762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1155172158 is a wasteful number, since it uses less digits than its factorization.

1155172158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14139 (or 14126 counting only the distinct ones).

The product of its digits is 14000, while the sum is 36.

The square root of 1155172158 is about 33987.8236726037. The cubic root of 1155172158 is about 1049.2578756011.

Adding to 1155172158 its reverse (8512715511), we get a palindrome (9667887669).

The spelling of 1155172158 in words is "one billion, one hundred fifty-five million, one hundred seventy-two thousand, one hundred fifty-eight".