91063993 has 8 divisors (see below), whose sum is σ = 95807880. Its totient is φ = 86440320.

The previous prime is 91063991. The next prime is 91063997. The reversal of 91063993 is 39936019.

It can be written as a sum of positive squares in 4 ways, for example, as 39841344 + 51222649 = 6312^2 + 7157^2 .

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 91063993 - 2¹ = 91063991 is a prime.

It is a super-2 number, since 2×91063993² = 16585301642208098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91063991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28498 + ... + 31531.

It is an arithmetic number, because the mean of its divisors is an integer number (11975985).

Almost surely, 2^91063993 is an apocalyptic number.

It is an amenable number.

91063993 is a deficient number, since it is larger than the sum of its proper divisors (4743887).

91063993 is a wasteful number, since it uses less digits than its factorization.

91063993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60107.

The product of its (nonzero) digits is 39366, while the sum is 40.

The square root of 91063993 is about 9542.7455692793. The cubic root of 91063993 is about 449.8995545358.

The spelling of 91063993 in words is "ninety-one million, sixty-three thousand, nine hundred ninety-three".