19216871 has 2 divisors, whose sum is σ = 19216872. Its totient is φ = 19216870.

The previous prime is 19216859. The next prime is 19216877. The reversal of 19216871 is 17861291.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19216871 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19216877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9608435 + 9608436.

It is an arithmetic number, because the mean of its divisors is an integer number (9608436).

Almost surely, 2^19216871 is an apocalyptic number.

19216871 is a deficient number, since it is larger than the sum of its proper divisors (1).

19216871 is an equidigital number, since it uses as much as digits as its factorization.

19216871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 35.

The square root of 19216871 is about 4383.7051680057. The cubic root of 19216871 is about 267.8515876503.

The spelling of 19216871 in words is "nineteen million, two hundred sixteen thousand, eight hundred seventy-one".