1156521155 has 8 divisors (see below), whose sum is σ = 1388606784. Its totient is φ = 924696000.

The previous prime is 1156521139. The next prime is 1156521161. The reversal of 1156521155 is 5511256511.

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

It is not a de Polignac number, because 1156521155 - 2⁴ = 1156521139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55211 + ... + 73220.

It is an arithmetic number, because the mean of its divisors is an integer number (173575848).

Almost surely, 2^1156521155 is an apocalyptic number.

1156521155 is a deficient number, since it is larger than the sum of its proper divisors (232085629).

1156521155 is a wasteful number, since it uses less digits than its factorization.

1156521155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130237.

The product of its digits is 7500, while the sum is 32.

The square root of 1156521155 is about 34007.6631805245. The cubic root of 1156521155 is about 1049.6661538804. Note that the first 3 decimals are identical.

Adding to 1156521155 its reverse (5511256511), we get a palindrome (6667777666).

The spelling of 1156521155 in words is "one billion, one hundred fifty-six million, five hundred twenty-one thousand, one hundred fifty-five".