1990301842391 has 2 divisors, whose sum is σ = 1990301842392. Its totient is φ = 1990301842390.

The previous prime is 1990301842387. The next prime is 1990301842453. The reversal of 1990301842391 is 1932481030991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1990301842391 - 2² = 1990301842387 is a prime.

It is a super-2 number, since 2×1990301842391² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990301842301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995150921195 + 995150921196.

It is an arithmetic number, because the mean of its divisors is an integer number (995150921196).

Almost surely, 2^{1990301842391} is an apocalyptic number.

1990301842391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990301842391 is an equidigital number, since it uses as much as digits as its factorization.

1990301842391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 50.

The spelling of 1990301842391 in words is "one trillion, nine hundred ninety billion, three hundred one million, eight hundred forty-two thousand, three hundred ninety-one".