91970393 has 8 divisors (see below), whose sum is σ = 96909120. Its totient is φ = 87041520.

The previous prime is 91970387. The next prime is 91970413. The reversal of 91970393 is 39307919.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91970393 - 2⁴ = 91970377 is a prime.

It is a super-3 number, since 3×91970393³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91970393.

It is not an unprimeable number, because it can be changed into a prime (91970303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24203 + ... + 27743.

It is an arithmetic number, because the mean of its divisors is an integer number (12113640).

Almost surely, 2^91970393 is an apocalyptic number.

It is an amenable number.

91970393 is a deficient number, since it is larger than the sum of its proper divisors (4938727).

91970393 is a wasteful number, since it uses less digits than its factorization.

91970393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4927.

The product of its (nonzero) digits is 45927, while the sum is 41.

The square root of 91970393 is about 9590.1195508711. The cubic root of 91970393 is about 451.3873120544.

The spelling of 91970393 in words is "ninety-one million, nine hundred seventy thousand, three hundred ninety-three".