1087775989 has 4 divisors (see below), whose sum is σ = 1093242400. Its totient is φ = 1082309580.

The previous prime is 1087775977. The next prime is 1087775999. The reversal of 1087775989 is 9895777801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1087775989 - 2¹¹ = 1087773941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1087775999) 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, 2732907 + ... + 2733304.

It is an arithmetic number, because the mean of its divisors is an integer number (273310600).

Almost surely, 2^1087775989 is an apocalyptic number.

It is an amenable number.

1087775989 is a deficient number, since it is larger than the sum of its proper divisors (5466411).

1087775989 is an equidigital number, since it uses as much as digits as its factorization.

1087775989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5466410.

The product of its (nonzero) digits is 8890560, while the sum is 61.

The square root of 1087775989 is about 32981.4491646441. The cubic root of 1087775989 is about 1028.4420437515.

The spelling of 1087775989 in words is "one billion, eighty-seven million, seven hundred seventy-five thousand, nine hundred eighty-nine".