1099201987 has 4 divisors (see below), whose sum is σ = 1183756000. Its totient is φ = 1014647976.

The previous prime is 1099201981. The next prime is 1099202021. The reversal of 1099201987 is 7891029901.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7891029901 = 107 ⋅73747943.

It is a cyclic number.

It is not a de Polignac number, because 1099201987 - 2³ = 1099201979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1099201981) 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, 42276987 + ... + 42277012.

It is an arithmetic number, because the mean of its divisors is an integer number (295939000).

Almost surely, 2^1099201987 is an apocalyptic number.

1099201987 is a deficient number, since it is larger than the sum of its proper divisors (84554013).

1099201987 is an equidigital number, since it uses as much as digits as its factorization.

1099201987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84554012.

The product of its (nonzero) digits is 81648, while the sum is 46.

The square root of 1099201987 is about 33154.2152222006. The cubic root of 1099201987 is about 1032.0304268992.

The spelling of 1099201987 in words is "one billion, ninety-nine million, two hundred one thousand, nine hundred eighty-seven".