91163321 has 4 divisors (see below), whose sum is σ = 91190052. Its totient is φ = 91136592.

The previous prime is 91163291. The next prime is 91163351. The reversal of 91163321 is 12336119.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12336119 = 23 ⋅536353.

It is an interprime number because it is at equal distance from previous prime (91163291) and next prime (91163351).

It can be written as a sum of positive squares in 2 ways, for example, as 54922921 + 36240400 = 7411^2 + 6020^2 .

It is a cyclic number.

It is not a de Polignac number, because 91163321 - 2²² = 86969017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91163351) 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, 7346 + ... + 15371.

It is an arithmetic number, because the mean of its divisors is an integer number (22797513).

Almost surely, 2^91163321 is an apocalyptic number.

It is an amenable number.

91163321 is a deficient number, since it is larger than the sum of its proper divisors (26731).

91163321 is a wasteful number, since it uses less digits than its factorization.

91163321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26730.

The product of its digits is 972, while the sum is 26.

The square root of 91163321 is about 9547.9485231122. The cubic root of 91163321 is about 450.0630709951.

The spelling of 91163321 in words is "ninety-one million, one hundred sixty-three thousand, three hundred twenty-one".