90231623 has 4 divisors (see below), whose sum is σ = 90258168. Its totient is φ = 90205080.

The previous prime is 90231619. The next prime is 90231637. The reversal of 90231623 is 32613209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32613209 = 31 ⋅1052039.

It is a cyclic number.

It is not a de Polignac number, because 90231623 - 2² = 90231619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90231592 and 90231601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90231643) 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 in 3 ways as a sum of consecutive naturals, for example, 7268 + ... + 15273.

It is an arithmetic number, because the mean of its divisors is an integer number (22564542).

Almost surely, 2^90231623 is an apocalyptic number.

90231623 is a deficient number, since it is larger than the sum of its proper divisors (26545).

90231623 is a wasteful number, since it uses less digits than its factorization.

90231623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26544.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 90231623 is about 9499.0327402320. The cubic root of 90231623 is about 448.5245884423.

The spelling of 90231623 in words is "ninety million, two hundred thirty-one thousand, six hundred twenty-three".