19650945731 has 2 divisors, whose sum is σ = 19650945732. Its totient is φ = 19650945730.

The previous prime is 19650945709. The next prime is 19650945737. The reversal of 19650945731 is 13754905691.

It is a strong prime.

It is an emirp because it is prime and its reverse (13754905691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19650945731 - 2¹⁸ = 19650683587 is a prime.

It is a super-2 number, since 2×19650945731² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19650945731.

It is not a weakly prime, because it can be changed into another prime (19650945737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9825472865 + 9825472866.

It is an arithmetic number, because the mean of its divisors is an integer number (9825472866).

Almost surely, 2^19650945731 is an apocalyptic number.

19650945731 is a deficient number, since it is larger than the sum of its proper divisors (1).

19650945731 is an equidigital number, since it uses as much as digits as its factorization.

19650945731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1020600, while the sum is 50.

The spelling of 19650945731 in words is "nineteen billion, six hundred fifty million, nine hundred forty-five thousand, seven hundred thirty-one".