91521323 has 2 divisors, whose sum is σ = 91521324. Its totient is φ = 91521322.

The previous prime is 91521293. The next prime is 91521337. The reversal of 91521323 is 32312519.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91521323 - 2¹² = 91517227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91521292 and 91521301.

It is not a weakly prime, because it can be changed into another prime (91521373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45760661 + 45760662.

It is an arithmetic number, because the mean of its divisors is an integer number (45760662).

Almost surely, 2^91521323 is an apocalyptic number.

91521323 is a deficient number, since it is larger than the sum of its proper divisors (1).

91521323 is an equidigital number, since it uses as much as digits as its factorization.

91521323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 26.

The square root of 91521323 is about 9566.6777409924. The cubic root of 91521323 is about 450.6514400304.

The spelling of 91521323 in words is "ninety-one million, five hundred twenty-one thousand, three hundred twenty-three".