91784423 has 2 divisors, whose sum is σ = 91784424. Its totient is φ = 91784422.

The previous prime is 91784419. The next prime is 91784461. The reversal of 91784423 is 32448719.

It is an a-pointer prime, because the next prime (91784461) can be obtained adding 91784423 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91784423 - 2² = 91784419 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91784123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45892211 + 45892212.

It is an arithmetic number, because the mean of its divisors is an integer number (45892212).

Almost surely, 2^91784423 is an apocalyptic number.

91784423 is a deficient number, since it is larger than the sum of its proper divisors (1).

91784423 is an equidigital number, since it uses as much as digits as its factorization.

91784423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 91784423 is about 9580.4187278010. The cubic root of 91784423 is about 451.0828621124.

The spelling of 91784423 in words is "ninety-one million, seven hundred eighty-four thousand, four hundred twenty-three".