102815863 has 2 divisors, whose sum is σ = 102815864. Its totient is φ = 102815862.

The previous prime is 102815861. The next prime is 102815899. The reversal of 102815863 is 368518201.

It is a weak prime.

It is an emirp because it is prime and its reverse (368518201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102815863 - 2¹ = 102815861 is a prime.

It is a super-2 number, since 2×102815863² = 21142203368869538, which contains 22 as substring.

Together with 102815861, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102815861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51407931 + 51407932.

It is an arithmetic number, because the mean of its divisors is an integer number (51407932).

Almost surely, 2^102815863 is an apocalyptic number.

102815863 is a deficient number, since it is larger than the sum of its proper divisors (1).

102815863 is an equidigital number, since it uses as much as digits as its factorization.

102815863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 102815863 is about 10139.8157281087. The cubic root of 102815863 is about 468.4753112290.

The spelling of 102815863 in words is "one hundred two million, eight hundred fifteen thousand, eight hundred sixty-three".