19954969 has 2 divisors, whose sum is σ = 19954970. Its totient is φ = 19954968.

The previous prime is 19954939. The next prime is 19954981. The reversal of 19954969 is 96945991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17330569 + 2624400 = 4163^2 + 1620^2 .

It is an emirp because it is prime and its reverse (96945991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19954969 - 2⁷ = 19954841 is a prime.

It is a super-2 number, since 2×19954969² = 796401575581922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19954939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9977484 + 9977485.

It is an arithmetic number, because the mean of its divisors is an integer number (9977485).

Almost surely, 2^19954969 is an apocalyptic number.

It is an amenable number.

19954969 is a deficient number, since it is larger than the sum of its proper divisors (1).

19954969 is an equidigital number, since it uses as much as digits as its factorization.

19954969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 787320, while the sum is 52.

The square root of 19954969 is about 4467.0984990260. The cubic root of 19954969 is about 271.2378870054.

The spelling of 19954969 in words is "nineteen million, nine hundred fifty-four thousand, nine hundred sixty-nine".