817542023 has 2 divisors, whose sum is σ = 817542024. Its totient is φ = 817542022.

The previous prime is 817542001. The next prime is 817542041. The reversal of 817542023 is 320245718.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 817542023 - 2¹⁶ = 817476487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (817542043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408771011 + 408771012.

It is an arithmetic number, because the mean of its divisors is an integer number (408771012).

Almost surely, 2^817542023 is an apocalyptic number.

817542023 is a deficient number, since it is larger than the sum of its proper divisors (1).

817542023 is an equidigital number, since it uses as much as digits as its factorization.

817542023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 817542023 is about 28592.6917760465. The cubic root of 817542023 is about 935.0540058599.

The spelling of 817542023 in words is "eight hundred seventeen million, five hundred forty-two thousand, twenty-three".