699221 has 2 divisors, whose sum is σ = 699222. Its totient is φ = 699220.

The previous prime is 699217. The next prime is 699241. The reversal of 699221 is 122996.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 600625 + 98596 = 775^2 + 314^2 .

It is a cyclic number.

It is not a de Polignac number, because 699221 - 2² = 699217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (699211) 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, 349610 + 349611.

It is an arithmetic number, because the mean of its divisors is an integer number (349611).

2⁶⁹⁹²²¹ is an apocalyptic number.

It is an amenable number.

699221 is a deficient number, since it is larger than the sum of its proper divisors (1).

699221 is an equidigital number, since it uses as much as digits as its factorization.

699221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 29.

The square root of 699221 is about 836.1943553983. The cubic root of 699221 is about 88.7574509383.

The spelling of 699221 in words is "six hundred ninety-nine thousand, two hundred twenty-one".