1087213805 has 8 divisors (see below), whose sum is σ = 1304839032. Its totient is φ = 869649408.

The previous prime is 1087213781. The next prime is 1087213843. The reversal of 1087213805 is 5083127801.

It can be written as a sum of positive squares in 4 ways, for example, as 427083556 + 660130249 = 20666^2 + 25693^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1087213805 - 2²² = 1083019501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48029 + ... + 66941.

It is an arithmetic number, because the mean of its divisors is an integer number (163104879).

Almost surely, 2^1087213805 is an apocalyptic number.

It is an amenable number.

1087213805 is a deficient number, since it is larger than the sum of its proper divisors (217625227).

1087213805 is a wasteful number, since it uses less digits than its factorization.

1087213805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30415.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 1087213805 is about 32972.9253327635. The cubic root of 1087213805 is about 1028.2648402034.

The spelling of 1087213805 in words is "one billion, eighty-seven million, two hundred thirteen thousand, eight hundred five".