1820191000001 has 8 divisors (see below), whose sum is σ = 1993212961344. Its totient is φ = 1648427380720.

The previous prime is 1820190999899. The next prime is 1820191000009. The reversal of 1820191000001 is 1000001910281.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1820191000001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1820191000009) 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, 314582486 + ... + 314588271.

It is an arithmetic number, because the mean of its divisors is an integer number (249151620168).

Almost surely, 2^{1820191000001} is an apocalyptic number.

1820191000001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1820191000001 is a deficient number, since it is larger than the sum of its proper divisors (173021961343).

1820191000001 is a wasteful number, since it uses less digits than its factorization.

1820191000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629171031.

The product of its (nonzero) digits is 144, while the sum is 23.

Adding to 1820191000001 its reverse (1000001910281), we get a palindrome (2820192910282).

The spelling of 1820191000001 in words is "one trillion, eight hundred twenty billion, one hundred ninety-one million, one", and thus it is an aban number.