19961369 has 2 divisors, whose sum is σ = 19961370. Its totient is φ = 19961368.

The previous prime is 19961363. The next prime is 19961371. The reversal of 19961369 is 96316991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 1471369 = 4300^2 + 1213^2 .

It is an emirp because it is prime and its reverse (96316991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19961369 - 2²⁰ = 18912793 is a prime.

It is a super-2 number, since 2×19961369² = 796912504708322, which contains 22 as substring.

Together with 19961371, 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 (19961363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9980684 + 9980685.

It is an arithmetic number, because the mean of its divisors is an integer number (9980685).

Almost surely, 2^19961369 is an apocalyptic number.

It is an amenable number.

19961369 is a deficient number, since it is larger than the sum of its proper divisors (1).

19961369 is an equidigital number, since it uses as much as digits as its factorization.

19961369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78732, while the sum is 44.

The square root of 19961369 is about 4467.8147902526. The cubic root of 19961369 is about 271.2668812361.

The spelling of 19961369 in words is "nineteen million, nine hundred sixty-one thousand, three hundred sixty-nine".