697643 has 2 divisors, whose sum is σ = 697644. Its totient is φ = 697642.

The previous prime is 697637. The next prime is 697673. The reversal of 697643 is 346796.

697643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 697643 - 2⁶ = 697579 is a prime.

It is an Ulam number.

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 697643.

It is not a weakly prime, because it can be changed into another prime (697603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348821 + 348822.

It is an arithmetic number, because the mean of its divisors is an integer number (348822).

2⁶⁹⁷⁶⁴³ is an apocalyptic number.

697643 is a deficient number, since it is larger than the sum of its proper divisors (1).

697643 is an equidigital number, since it uses as much as digits as its factorization.

697643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 35.

The square root of 697643 is about 835.2502618976. The cubic root of 697643 is about 88.6906314579.

The spelling of 697643 in words is "six hundred ninety-seven thousand, six hundred forty-three".