689235971 has 2 divisors, whose sum is σ = 689235972. Its totient is φ = 689235970.

The previous prime is 689235961. The next prime is 689235973. The reversal of 689235971 is 179532986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689235971 - 2¹⁸ = 688973827 is a prime.

Together with 689235973, 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 (689235973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344617985 + 344617986.

It is an arithmetic number, because the mean of its divisors is an integer number (344617986).

Almost surely, 2^689235971 is an apocalyptic number.

689235971 is a deficient number, since it is larger than the sum of its proper divisors (1).

689235971 is an equidigital number, since it uses as much as digits as its factorization.

689235971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 50.

The square root of 689235971 is about 26253.3040015919. The cubic root of 689235971 is about 883.3293179201.

The spelling of 689235971 in words is "six hundred eighty-nine million, two hundred thirty-five thousand, nine hundred seventy-one".