90817943 has 4 divisors (see below), whose sum is σ = 93272520. Its totient is φ = 88363368.

The previous prime is 90817931. The next prime is 90817949. The reversal of 90817943 is 34971809.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90817943 - 2¹⁰ = 90816919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90817943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90817949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1227233 + ... + 1227306.

It is an arithmetic number, because the mean of its divisors is an integer number (23318130).

Almost surely, 2^90817943 is an apocalyptic number.

90817943 is a deficient number, since it is larger than the sum of its proper divisors (2454577).

90817943 is a wasteful number, since it uses less digits than its factorization.

90817943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2454576.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 90817943 is about 9529.8448570793. The cubic root of 90817943 is about 449.4939875951.

The spelling of 90817943 in words is "ninety million, eight hundred seventeen thousand, nine hundred forty-three".