201819092001 has 4 divisors (see below), whose sum is σ = 269092122672. Its totient is φ = 134546061332.

The previous prime is 201819091997. The next prime is 201819092003. The reversal of 201819092001 is 100290918102.

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 201819092001 - 2² = 201819091997 is a prime.

It is a super-2 number, since 2×201819092001² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201819092003) 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, 33636515331 + ... + 33636515336.

It is an arithmetic number, because the mean of its divisors is an integer number (67273030668).

Almost surely, 2^201819092001 is an apocalyptic number.

It is an amenable number.

201819092001 is a deficient number, since it is larger than the sum of its proper divisors (67273030671).

201819092001 is an equidigital number, since it uses as much as digits as its factorization.

201819092001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67273030670.

The product of its (nonzero) digits is 2592, while the sum is 33.

The spelling of 201819092001 in words is "two hundred one billion, eight hundred nineteen million, ninety-two thousand, one".