1099010991 has 8 divisors (see below), whose sum is σ = 1578067120. Its totient is φ = 676314432.

The previous prime is 1099010981. The next prime is 1099011029. The reversal of 1099010991 is 1990109901.

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

It is not a de Polignac number, because 1099010991 - 2⁵ = 1099010959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 28179769 = 1099010991 / (1 + 0 + 9 + 9 + 0 + 1 + 0 + 9 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099010971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14089846 + ... + 14089923.

It is an arithmetic number, because the mean of its divisors is an integer number (197258390).

Almost surely, 2^1099010991 is an apocalyptic number.

1099010991 is a deficient number, since it is larger than the sum of its proper divisors (479056129).

1099010991 is a wasteful number, since it uses less digits than its factorization.

1099010991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28179785.

The product of its (nonzero) digits is 6561, while the sum is 39.

The square root of 1099010991 is about 33151.3346790141. The cubic root of 1099010991 is about 1031.9706486529.

The spelling of 1099010991 in words is "one billion, ninety-nine million, ten thousand, nine hundred ninety-one".