19901619371 has 2 divisors, whose sum is σ = 19901619372. Its totient is φ = 19901619370.

The previous prime is 19901619359. The next prime is 19901619461. The reversal of 19901619371 is 17391610991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19901619371 - 2¹⁸ = 19901357227 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (19901619341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950809685 + 9950809686.

It is an arithmetic number, because the mean of its divisors is an integer number (9950809686).

Almost surely, 2^19901619371 is an apocalyptic number.

19901619371 is a deficient number, since it is larger than the sum of its proper divisors (1).

19901619371 is an equidigital number, since it uses as much as digits as its factorization.

19901619371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 47.

The spelling of 19901619371 in words is "nineteen billion, nine hundred one million, six hundred nineteen thousand, three hundred seventy-one".