19771223 has 2 divisors, whose sum is σ = 19771224. Its totient is φ = 19771222.

The previous prime is 19771217. The next prime is 19771249. The reversal of 19771223 is 32217791.

It is a weak prime.

It is an emirp because it is prime and its reverse (32217791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19771223 - 2⁸ = 19770967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19771223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19771523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9885611 + 9885612.

It is an arithmetic number, because the mean of its divisors is an integer number (9885612).

Almost surely, 2^19771223 is an apocalyptic number.

19771223 is a deficient number, since it is larger than the sum of its proper divisors (1).

19771223 is an equidigital number, since it uses as much as digits as its factorization.

19771223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 32.

The square root of 19771223 is about 4446.4843415894. The cubic root of 19771223 is about 270.4027961427.

The spelling of 19771223 in words is "nineteen million, seven hundred seventy-one thousand, two hundred twenty-three".