19941641 has 2 divisors, whose sum is σ = 19941642. Its totient is φ = 19941640.

The previous prime is 19941617. The next prime is 19941643. The reversal of 19941641 is 14614991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16687225 + 3254416 = 4085^2 + 1804^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19941641 is a prime.

Together with 19941643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19941643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9970820 + 9970821.

It is an arithmetic number, because the mean of its divisors is an integer number (9970821).

Almost surely, 2^19941641 is an apocalyptic number.

It is an amenable number.

19941641 is a deficient number, since it is larger than the sum of its proper divisors (1).

19941641 is an equidigital number, since it uses as much as digits as its factorization.

19941641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 19941641 is about 4465.6064537753. The cubic root of 19941641 is about 271.1774866160.

The spelling of 19941641 in words is "nineteen million, nine hundred forty-one thousand, six hundred forty-one".