91994519 has 2 divisors, whose sum is σ = 91994520. Its totient is φ = 91994518.

The previous prime is 91994491. The next prime is 91994521. The reversal of 91994519 is 91549919.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91994519 - 2¹⁶ = 91928983 is a prime.

It is a super-2 number, since 2×91994519² = 16925983052082722, which contains 22 as substring.

Together with 91994521, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91994579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45997259 + 45997260.

It is an arithmetic number, because the mean of its divisors is an integer number (45997260).

Almost surely, 2^91994519 is an apocalyptic number.

91994519 is a deficient number, since it is larger than the sum of its proper divisors (1).

91994519 is an equidigital number, since it uses as much as digits as its factorization.

91994519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 47.

The square root of 91994519 is about 9591.3773254940. The cubic root of 91994519 is about 451.4267784443.

The spelling of 91994519 in words is "ninety-one million, nine hundred ninety-four thousand, five hundred nineteen".