697836221 has 2 divisors, whose sum is σ = 697836222. Its totient is φ = 697836220.

The previous prime is 697836211. The next prime is 697836233. The reversal of 697836221 is 122638796.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 412699225 + 285136996 = 20315^2 + 16886^2 .

It is a cyclic number.

It is not a de Polignac number, because 697836221 - 2²² = 693641917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697836211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348918110 + 348918111.

It is an arithmetic number, because the mean of its divisors is an integer number (348918111).

Almost surely, 2^697836221 is an apocalyptic number.

It is an amenable number.

697836221 is a deficient number, since it is larger than the sum of its proper divisors (1).

697836221 is an equidigital number, since it uses as much as digits as its factorization.

697836221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 697836221 is about 26416.5898821176. The cubic root of 697836221 is about 886.9881869726.

The spelling of 697836221 in words is "six hundred ninety-seven million, eight hundred thirty-six thousand, two hundred twenty-one".