1155378159 has 24 divisors (see below), whose sum is σ = 1875400800. Its totient is φ = 680087232.

The previous prime is 1155378149. The next prime is 1155378167. The reversal of 1155378159 is 9518735511.

1155378159 is a `hidden beast` number, since 11 + 553 + 7 + 81 + 5 + 9 = 666.

It is not a de Polignac number, because 1155378159 - 2⁴ = 1155378143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155378139) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 211984 + ... + 217365.

It is an arithmetic number, because the mean of its divisors is an integer number (78141700).

Almost surely, 2^1155378159 is an apocalyptic number.

1155378159 is a deficient number, since it is larger than the sum of its proper divisors (720022641).

1155378159 is a wasteful number, since it uses less digits than its factorization.

1155378159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429391 (or 429388 counting only the distinct ones).

The product of its digits is 189000, while the sum is 45.

The square root of 1155378159 is about 33990.8540492880. The cubic root of 1155378159 is about 1049.3202430219.

The spelling of 1155378159 in words is "one billion, one hundred fifty-five million, three hundred seventy-eight thousand, one hundred fifty-nine".