1091983801 has 4 divisors (see below), whose sum is σ = 1092184704. Its totient is φ = 1091782900.

The previous prime is 1091983799. The next prime is 1091983813. The reversal of 1091983801 is 1083891901.

It is a happy number.

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 1091983801 - 2¹ = 1091983799 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091983001) 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, 92065 + ... + 103246.

It is an arithmetic number, because the mean of its divisors is an integer number (273046176).

Almost surely, 2^1091983801 is an apocalyptic number.

It is an amenable number.

1091983801 is a deficient number, since it is larger than the sum of its proper divisors (200903).

1091983801 is an equidigital number, since it uses as much as digits as its factorization.

1091983801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200902.

The product of its (nonzero) digits is 15552, while the sum is 40.

The square root of 1091983801 is about 33045.1781807876. The cubic root of 1091983801 is about 1029.7664349279.

The spelling of 1091983801 in words is "one billion, ninety-one million, nine hundred eighty-three thousand, eight hundred one".