919691 has 2 divisors, whose sum is σ = 919692. Its totient is φ = 919690.

The previous prime is 919679. The next prime is 919693. The reversal of 919691 is 196919.

It is a strong prime.

It is an emirp because it is prime and its reverse (196919) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-919691 is a prime.

It is a super-3 number, since 3×919691³ = 2333710952094169113, which contains 333 as substring.

Together with 919693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (919693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459845 + 459846.

It is an arithmetic number, because the mean of its divisors is an integer number (459846).

2⁹¹⁹⁶⁹¹ is an apocalyptic number.

919691 is a deficient number, since it is larger than the sum of its proper divisors (1).

919691 is an equidigital number, since it uses as much as digits as its factorization.

919691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4374, while the sum is 35.

The square root of 919691 is about 959.0052137502. The cubic root of 919691 is about 97.2479926364.

The spelling of 919691 in words is "nine hundred nineteen thousand, six hundred ninety-one".