90189863 has 2 divisors, whose sum is σ = 90189864. Its totient is φ = 90189862.

The previous prime is 90189857. The next prime is 90189871. The reversal of 90189863 is 36898109.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90189863 - 2²⁶ = 23080999 is a prime.

It is a super-2 number, since 2×90189863² = 16268422775917538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90182863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45094931 + 45094932.

It is an arithmetic number, because the mean of its divisors is an integer number (45094932).

Almost surely, 2^90189863 is an apocalyptic number.

90189863 is a deficient number, since it is larger than the sum of its proper divisors (1).

90189863 is an equidigital number, since it uses as much as digits as its factorization.

90189863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 90189863 is about 9496.8343673037. The cubic root of 90189863 is about 448.4553840383.

It can be divided in two parts, 9018 and 9863, that added together give a palindrome (18881).

The spelling of 90189863 in words is "ninety million, one hundred eighty-nine thousand, eight hundred sixty-three".