1181555157 has 16 divisors (see below), whose sum is σ = 1593752832. Its totient is φ = 778552320.

The previous prime is 1181555119. The next prime is 1181555171. The reversal of 1181555157 is 7515551811.

It is not a de Polignac number, because 1181555157 - 2⁶ = 1181555093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181555107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262873 + ... + 267329.

It is an arithmetic number, because the mean of its divisors is an integer number (99609552).

Almost surely, 2^1181555157 is an apocalyptic number.

It is an amenable number.

1181555157 is a deficient number, since it is larger than the sum of its proper divisors (412197675).

1181555157 is an equidigital number, since it uses as much as digits as its factorization.

1181555157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5468.

The product of its digits is 35000, while the sum is 39.

The square root of 1181555157 is about 34373.7568066105. The cubic root of 1181555157 is about 1057.1858298047.

The spelling of 1181555157 in words is "one billion, one hundred eighty-one million, five hundred fifty-five thousand, one hundred fifty-seven".