2001973091397 has 4 divisors (see below), whose sum is σ = 2669297455200. Its totient is φ = 1334648727596.

The previous prime is 2001973091387. The next prime is 2001973091449. The reversal of 2001973091397 is 7931903791002.

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 2001973091397 - 2⁷ = 2001973091269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001973091387) 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, 333662181897 + ... + 333662181902.

It is an arithmetic number, because the mean of its divisors is an integer number (667324363800).

Almost surely, 2^{2001973091397} is an apocalyptic number.

It is an amenable number.

2001973091397 is a deficient number, since it is larger than the sum of its proper divisors (667324363803).

2001973091397 is an equidigital number, since it uses as much as digits as its factorization.

2001973091397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667324363802.

The product of its (nonzero) digits is 642978, while the sum is 51.

The spelling of 2001973091397 in words is "two trillion, one billion, nine hundred seventy-three million, ninety-one thousand, three hundred ninety-seven".