823542043 has 2 divisors, whose sum is σ = 823542044. Its totient is φ = 823542042.

The previous prime is 823542017. The next prime is 823542053. The reversal of 823542043 is 340245328.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-823542043 is a prime.

It is a super-2 number, since 2×823542043² = 1356442993177227698, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 823541996 and 823542014.

It is not a weakly prime, because it can be changed into another prime (823542053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411771021 + 411771022.

It is an arithmetic number, because the mean of its divisors is an integer number (411771022).

Almost surely, 2^823542043 is an apocalyptic number.

823542043 is a deficient number, since it is larger than the sum of its proper divisors (1).

823542043 is an equidigital number, since it uses as much as digits as its factorization.

823542043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 823542043 is about 28697.4222361522. The cubic root of 823542043 is about 937.3359164804.

The spelling of 823542043 in words is "eight hundred twenty-three million, five hundred forty-two thousand, forty-three".