1087639817 has 4 divisors (see below), whose sum is σ = 1186516176. Its totient is φ = 988763460.

The previous prime is 1087639793. The next prime is 1087639843. The reversal of 1087639817 is 7189367801.

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 1087639817 - 2¹² = 1087635721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1087639417) 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, 49438163 + ... + 49438184.

It is an arithmetic number, because the mean of its divisors is an integer number (296629044).

Almost surely, 2^1087639817 is an apocalyptic number.

It is an amenable number.

1087639817 is a deficient number, since it is larger than the sum of its proper divisors (98876359).

1087639817 is an equidigital number, since it uses as much as digits as its factorization.

1087639817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98876358.

The product of its (nonzero) digits is 508032, while the sum is 50.

The square root of 1087639817 is about 32979.3847274324. The cubic root of 1087639817 is about 1028.3991271781.

The spelling of 1087639817 in words is "one billion, eighty-seven million, six hundred thirty-nine thousand, eight hundred seventeen".