90861911 has 4 divisors (see below), whose sum is σ = 103842192. Its totient is φ = 77881632.

The previous prime is 90861907. The next prime is 90861917. The reversal of 90861911 is 11916809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11916809 = 3373 ⋅3533.

It is a cyclic number.

It is not a de Polignac number, because 90861911 - 2² = 90861907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90861917) 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, 6490130 + ... + 6490143.

It is an arithmetic number, because the mean of its divisors is an integer number (25960548).

Almost surely, 2^90861911 is an apocalyptic number.

90861911 is a deficient number, since it is larger than the sum of its proper divisors (12980281).

90861911 is a wasteful number, since it uses less digits than its factorization.

90861911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12980280.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 90861911 is about 9532.1514360610. The cubic root of 90861911 is about 449.5665142438.

The spelling of 90861911 in words is "ninety million, eight hundred sixty-one thousand, nine hundred eleven".