19716929 has 2 divisors, whose sum is σ = 19716930. Its totient is φ = 19716928.

The previous prime is 19716863. The next prime is 19716943. The reversal of 19716929 is 92961791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16386304 + 3330625 = 4048^2 + 1825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19716929 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19716929.

It is not a weakly prime, because it can be changed into another prime (19716959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9858464 + 9858465.

It is an arithmetic number, because the mean of its divisors is an integer number (9858465).

Almost surely, 2^19716929 is an apocalyptic number.

It is an amenable number.

19716929 is a deficient number, since it is larger than the sum of its proper divisors (1).

19716929 is an equidigital number, since it uses as much as digits as its factorization.

19716929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 44.

The square root of 19716929 is about 4440.3748715621. The cubic root of 19716929 is about 270.1550504040.

The spelling of 19716929 in words is "nineteen million, seven hundred sixteen thousand, nine hundred twenty-nine".