19741991 has 2 divisors, whose sum is σ = 19741992. Its totient is φ = 19741990.

The previous prime is 19741973. The next prime is 19741993. The reversal of 19741991 is 19914791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19741991 - 2¹⁸ = 19479847 is a prime.

Together with 19741993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19741993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9870995 + 9870996.

It is an arithmetic number, because the mean of its divisors is an integer number (9870996).

Almost surely, 2^19741991 is an apocalyptic number.

19741991 is a deficient number, since it is larger than the sum of its proper divisors (1).

19741991 is an equidigital number, since it uses as much as digits as its factorization.

19741991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 41.

The square root of 19741991 is about 4443.1960343879. The cubic root of 19741991 is about 270.2694657745.

The spelling of 19741991 in words is "nineteen million, seven hundred forty-one thousand, nine hundred ninety-one".