16215863 has 2 divisors, whose sum is σ = 16215864. Its totient is φ = 16215862.

The previous prime is 16215847. The next prime is 16215887. The reversal of 16215863 is 36851261.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16215863 - 2⁴ = 16215847 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16215803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8107931 + 8107932.

It is an arithmetic number, because the mean of its divisors is an integer number (8107932).

Almost surely, 2^16215863 is an apocalyptic number.

16215863 is a deficient number, since it is larger than the sum of its proper divisors (1).

16215863 is an equidigital number, since it uses as much as digits as its factorization.

16215863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The square root of 16215863 is about 4026.8924743529. The cubic root of 16215863 is about 253.1123613666.

The spelling of 16215863 in words is "sixteen million, two hundred fifteen thousand, eight hundred sixty-three".