91367321 has 4 divisors (see below), whose sum is σ = 91404852. Its totient is φ = 91329792.

The previous prime is 91367251. The next prime is 91367329. The reversal of 91367321 is 12376319.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12376319 = 569 ⋅21751.

It can be written as a sum of positive squares in 2 ways, for example, as 71910400 + 19456921 = 8480^2 + 4411^2 .

It is a cyclic number.

It is not a de Polignac number, because 91367321 - 2¹⁴ = 91350937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91367329) 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, 14840 + ... + 20073.

It is an arithmetic number, because the mean of its divisors is an integer number (22851213).

Almost surely, 2^91367321 is an apocalyptic number.

It is an amenable number.

91367321 is a deficient number, since it is larger than the sum of its proper divisors (37531).

91367321 is a wasteful number, since it uses less digits than its factorization.

91367321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37530.

The product of its digits is 6804, while the sum is 32.

The square root of 91367321 is about 9558.6254765003. The cubic root of 91367321 is about 450.3985292546.

The spelling of 91367321 in words is "ninety-one million, three hundred sixty-seven thousand, three hundred twenty-one".