823348991 has 2 divisors, whose sum is σ = 823348992. Its totient is φ = 823348990.

The previous prime is 823348973. The next prime is 823349027. The reversal of 823348991 is 199843328.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-823348991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823348951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411674495 + 411674496.

It is an arithmetic number, because the mean of its divisors is an integer number (411674496).

Almost surely, 2^823348991 is an apocalyptic number.

823348991 is a deficient number, since it is larger than the sum of its proper divisors (1).

823348991 is an equidigital number, since it uses as much as digits as its factorization.

823348991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 47.

The square root of 823348991 is about 28694.0584616398. The cubic root of 823348991 is about 937.2626683622.

The spelling of 823348991 in words is "eight hundred twenty-three million, three hundred forty-eight thousand, nine hundred ninety-one".