1155646385 has 16 divisors (see below), whose sum is σ = 1456310016. Its totient is φ = 878674368.

The previous prime is 1155646379. The next prime is 1155646391. The reversal of 1155646385 is 5836465511.

It is an interprime number because it is at equal distance from previous prime (1155646379) and next prime (1155646391).

It is a cyclic number.

It is not a de Polignac number, because 1155646385 - 2⁴ = 1155646369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13949 + ... + 50058.

It is an arithmetic number, because the mean of its divisors is an integer number (91019376).

Almost surely, 2^1155646385 is an apocalyptic number.

It is an amenable number.

1155646385 is a deficient number, since it is larger than the sum of its proper divisors (300663631).

1155646385 is a wasteful number, since it uses less digits than its factorization.

1155646385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64192.

The product of its digits is 432000, while the sum is 44.

The square root of 1155646385 is about 33994.7993816701. The cubic root of 1155646385 is about 1049.4014381388.

The spelling of 1155646385 in words is "one billion, one hundred fifty-five million, six hundred forty-six thousand, three hundred eighty-five".