90863191 has 2 divisors, whose sum is σ = 90863192. Its totient is φ = 90863190.

The previous prime is 90863183. The next prime is 90863207. The reversal of 90863191 is 19136809.

It is a weak prime.

It is an emirp because it is prime and its reverse (19136809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90863191 - 2³ = 90863183 is a prime.

It is a super-3 number, since 3×90863191³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 90863191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90863131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45431595 + 45431596.

It is an arithmetic number, because the mean of its divisors is an integer number (45431596).

Almost surely, 2^90863191 is an apocalyptic number.

90863191 is a deficient number, since it is larger than the sum of its proper divisors (1).

90863191 is an equidigital number, since it uses as much as digits as its factorization.

90863191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 90863191 is about 9532.2185770155. The cubic root of 90863191 is about 449.5686252950.

The spelling of 90863191 in words is "ninety million, eight hundred sixty-three thousand, one hundred ninety-one".