391363842997 has 4 divisors (see below), whose sum is σ = 391371184800. Its totient is φ = 391356501196.

The previous prime is 391363842971. The next prime is 391363843021. The reversal of 391363842997 is 799248363193.

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 391363842997 - 2⁷ = 391363842869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391303842997) 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, 3590353 + ... + 3697750.

It is an arithmetic number, because the mean of its divisors is an integer number (97842796200).

Almost surely, 2^391363842997 is an apocalyptic number.

It is an amenable number.

391363842997 is a deficient number, since it is larger than the sum of its proper divisors (7341803).

391363842997 is an equidigital number, since it uses as much as digits as its factorization.

391363842997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7341802.

The product of its digits is 52907904, while the sum is 64.

The spelling of 391363842997 in words is "three hundred ninety-one billion, three hundred sixty-three million, eight hundred forty-two thousand, nine hundred ninety-seven".