90973 has 4 divisors (see below), whose sum is σ = 94140. Its totient is φ = 87808.

The previous prime is 90971. The next prime is 90977. The reversal of 90973 is 37909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37909 = 167 ⋅227.

It can be written as a sum of positive squares in 2 ways, for example, as 77284 + 13689 = 278^2 + 117^2 .

It is a 4-Lehmer number, since φ(90973) divides (90973-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 90973 - 2¹ = 90971 is a prime.

It is an Ulam number.

It is a Duffinian number.

90973 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90971) 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, 1540 + ... + 1597.

It is an arithmetic number, because the mean of its divisors is an integer number (23535).

2⁹⁰⁹⁷³ is an apocalyptic number.

It is an amenable number.

90973 is a deficient number, since it is larger than the sum of its proper divisors (3167).

90973 is a wasteful number, since it uses less digits than its factorization.

90973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3166.

The product of its (nonzero) digits is 1701, while the sum is 28.

The square root of 90973 is about 301.6173071957. The cubic root of 90973 is about 44.9749654992.

The spelling of 90973 in words is "ninety thousand, nine hundred seventy-three".