1163256587 has 4 divisors (see below), whose sum is σ = 1167227040. Its totient is φ = 1159286136.

The previous prime is 1163256581. The next prime is 1163256643. The reversal of 1163256587 is 7856523611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1163256587 - 2²² = 1159062283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1163256581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1984787 + ... + 1985372.

It is an arithmetic number, because the mean of its divisors is an integer number (291806760).

Almost surely, 2^1163256587 is an apocalyptic number.

1163256587 is a deficient number, since it is larger than the sum of its proper divisors (3970453).

1163256587 is an equidigital number, since it uses as much as digits as its factorization.

1163256587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3970452.

The product of its digits is 302400, while the sum is 44.

The square root of 1163256587 is about 34106.5475678791. The cubic root of 1163256587 is about 1051.6999182052.

The spelling of 1163256587 in words is "one billion, one hundred sixty-three million, two hundred fifty-six thousand, five hundred eighty-seven".