91404233 has 2 divisors, whose sum is σ = 91404234. Its totient is φ = 91404232.

The previous prime is 91404227. The next prime is 91404251. The reversal of 91404233 is 33240419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85895824 + 5508409 = 9268^2 + 2347^2 .

It is a cyclic number.

It is not a de Polignac number, because 91404233 - 2¹⁶ = 91338697 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (91404253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45702116 + 45702117.

It is an arithmetic number, because the mean of its divisors is an integer number (45702117).

Almost surely, 2^91404233 is an apocalyptic number.

It is an amenable number.

91404233 is a deficient number, since it is larger than the sum of its proper divisors (1).

91404233 is an equidigital number, since it uses as much as digits as its factorization.

91404233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 91404233 is about 9560.5561030727. The cubic root of 91404233 is about 450.4591741038.

The spelling of 91404233 in words is "ninety-one million, four hundred four thousand, two hundred thirty-three".