1087565391 has 12 divisors (see below), whose sum is σ = 1713739560. Its totient is φ = 659130480.

The previous prime is 1087565363. The next prime is 1087565407. The reversal of 1087565391 is 1935657801.

It is a happy number.

1087565391 is a `hidden beast` number, since 1 + 0 + 87 + 565 + 3 + 9 + 1 = 666.

It is not a de Polignac number, because 1087565391 - 2⁵ = 1087565359 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1087565891) 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, 5492656 + ... + 5492853.

It is an arithmetic number, because the mean of its divisors is an integer number (142811630).

Almost surely, 2^1087565391 is an apocalyptic number.

1087565391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1087565391 is a deficient number, since it is larger than the sum of its proper divisors (626174169).

1087565391 is a wasteful number, since it uses less digits than its factorization.

1087565391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10985526 (or 10985523 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The square root of 1087565391 is about 32978.2563365621. The cubic root of 1087565391 is about 1028.3756692349.

The spelling of 1087565391 in words is "one billion, eighty-seven million, five hundred sixty-five thousand, three hundred ninety-one".