19418213 has 2 divisors, whose sum is σ = 19418214. Its totient is φ = 19418212.

The previous prime is 19418137. The next prime is 19418227. The reversal of 19418213 is 31281491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13667809 + 5750404 = 3697^2 + 2398^2 .

It is an emirp because it is prime and its reverse (31281491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19418213 - 2¹² = 19414117 is a prime.

It is a super-2 number, since 2×19418213² = 754133992226738, which contains 22 as substring.

It is a nialpdrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19418293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9709106 + 9709107.

It is an arithmetic number, because the mean of its divisors is an integer number (9709107).

Almost surely, 2^19418213 is an apocalyptic number.

It is an amenable number.

19418213 is a deficient number, since it is larger than the sum of its proper divisors (1).

19418213 is an equidigital number, since it uses as much as digits as its factorization.

19418213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 19418213 is about 4406.6101484021. The cubic root of 19418213 is about 268.7837983092.

The spelling of 19418213 in words is "nineteen million, four hundred eighteen thousand, two hundred thirteen".