91816783 has 2 divisors, whose sum is σ = 91816784. Its totient is φ = 91816782.

The previous prime is 91816757. The next prime is 91816787. The reversal of 91816783 is 38761819.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91816783 - 2⁹ = 91816271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91816787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45908391 + 45908392.

It is an arithmetic number, because the mean of its divisors is an integer number (45908392).

Almost surely, 2^91816783 is an apocalyptic number.

91816783 is a deficient number, since it is larger than the sum of its proper divisors (1).

91816783 is an equidigital number, since it uses as much as digits as its factorization.

91816783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 43.

The square root of 91816783 is about 9582.1074404329. The cubic root of 91816783 is about 451.1358679341.

The spelling of 91816783 in words is "ninety-one million, eight hundred sixteen thousand, seven hundred eighty-three".