91323773 has 4 divisors (see below), whose sum is σ = 93266880. Its totient is φ = 89380668.

The previous prime is 91323767. The next prime is 91323781. The reversal of 91323773 is 37732319.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37732319 = 1597 ⋅23627.

It is a cyclic number.

It is not a de Polignac number, because 91323773 - 2¹² = 91319677 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 (91323173) 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, 971483 + ... + 971576.

It is an arithmetic number, because the mean of its divisors is an integer number (23316720).

Almost surely, 2^91323773 is an apocalyptic number.

It is an amenable number.

91323773 is a deficient number, since it is larger than the sum of its proper divisors (1943107).

91323773 is a wasteful number, since it uses less digits than its factorization.

91323773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1943106.

The product of its digits is 23814, while the sum is 35.

The square root of 91323773 is about 9556.3472624220. The cubic root of 91323773 is about 450.3269607334.

The spelling of 91323773 in words is "ninety-one million, three hundred twenty-three thousand, seven hundred seventy-three".