930991 has 2 divisors, whose sum is σ = 930992. Its totient is φ = 930990.

The previous prime is 930989. The next prime is 931003. The reversal of 930991 is 199039.

It is a weak prime.

It is an emirp because it is prime and its reverse (199039) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 930991 - 2¹ = 930989 is a prime.

Together with 930989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (930911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 465495 + 465496.

It is an arithmetic number, because the mean of its divisors is an integer number (465496).

2⁹³⁰⁹⁹¹ is an apocalyptic number.

930991 is a deficient number, since it is larger than the sum of its proper divisors (1).

930991 is an equidigital number, since it uses as much as digits as its factorization.

930991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2187, while the sum is 31.

The square root of 930991 is about 964.8787488592. The cubic root of 930991 is about 97.6446592516.

The spelling of 930991 in words is "nine hundred thirty thousand, nine hundred ninety-one".