1156531055 has 4 divisors (see below), whose sum is σ = 1387837272. Its totient is φ = 925224840.

The previous prime is 1156531027. The next prime is 1156531067. The reversal of 1156531055 is 5501356511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5501356511 = 7 ⋅785908073.

It is not a de Polignac number, because 1156531055 - 2¹⁰ = 1156530031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115653101 + ... + 115653110.

It is an arithmetic number, because the mean of its divisors is an integer number (346959318).

Almost surely, 2^1156531055 is an apocalyptic number.

1156531055 is a deficient number, since it is larger than the sum of its proper divisors (231306217).

1156531055 is an equidigital number, since it uses as much as digits as its factorization.

1156531055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231306216.

The product of its (nonzero) digits is 11250, while the sum is 32.

The square root of 1156531055 is about 34007.8087356419. The cubic root of 1156531055 is about 1049.6691489734.

Adding to 1156531055 its reverse (5501356511), we get a palindrome (6657887566).

The spelling of 1156531055 in words is "one billion, one hundred fifty-six million, five hundred thirty-one thousand, fifty-five".