1156155 has 72 divisors (see below), whose sum is σ = 2547216. Its totient is φ = 443520.

The previous prime is 1156151. The next prime is 1156157. The reversal of 1156155 is 5516511.

It is not a de Polignac number, because 1156155 - 2² = 1156151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1156151) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 88929 + ... + 88941.

It is an arithmetic number, because the mean of its divisors is an integer number (35378).

2^1156155 is an apocalyptic number.

1156155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1156155 is an abundant number, since it is smaller than the sum of its proper divisors (1391061).

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

1156155 is a wasteful number, since it uses less digits than its factorization.

1156155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57 (or 39 counting only the distinct ones).

The product of its digits is 750, while the sum is 24.

The square root of 1156155 is about 1075.2464833702. The cubic root of 1156155 is about 104.9555367298.

The spelling of 1156155 in words is "one million, one hundred fifty-six thousand, one hundred fifty-five".