1155021157 has 12 divisors (see below), whose sum is σ = 1266549376. Its totient is φ = 1052003520.

The previous prime is 1155021149. The next prime is 1155021169. The reversal of 1155021157 is 7511205511.

It is not a de Polignac number, because 1155021157 - 2³ = 1155021149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155021137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55503 + ... + 73420.

Almost surely, 2^1155021157 is an apocalyptic number.

1155021157 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1155021157 is a deficient number, since it is larger than the sum of its proper divisors (111528219).

1155021157 is a wasteful number, since it uses less digits than its factorization.

1155021157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128988 (or 128971 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 28.

The square root of 1155021157 is about 33985.6022015206. The cubic root of 1155021157 is about 1049.2121548856.

Adding to 1155021157 its reverse (7511205511), we get a palindrome (8666226668).

The spelling of 1155021157 in words is "one billion, one hundred fifty-five million, twenty-one thousand, one hundred fifty-seven".