19996651 has 2 divisors, whose sum is σ = 19996652. Its totient is φ = 19996650.

The previous prime is 19996649. The next prime is 19996663. The reversal of 19996651 is 15669991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19996651 - 2¹ = 19996649 is a prime.

Together with 19996649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19996621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9998325 + 9998326.

It is an arithmetic number, because the mean of its divisors is an integer number (9998326).

Almost surely, 2^19996651 is an apocalyptic number.

19996651 is a deficient number, since it is larger than the sum of its proper divisors (1).

19996651 is an equidigital number, since it uses as much as digits as its factorization.

19996651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131220, while the sum is 46.

The square root of 19996651 is about 4471.7615097409. The cubic root of 19996651 is about 271.4266098394.

The spelling of 19996651 in words is "nineteen million, nine hundred ninety-six thousand, six hundred fifty-one".