699077221 has 2 divisors, whose sum is σ = 699077222. Its totient is φ = 699077220.

The previous prime is 699077189. The next prime is 699077227. The reversal of 699077221 is 122770996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 670240321 + 28836900 = 25889^2 + 5370^2 .

It is a cyclic number.

It is not a de Polignac number, because 699077221 - 2⁵ = 699077189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (699077227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349538610 + 349538611.

It is an arithmetic number, because the mean of its divisors is an integer number (349538611).

Almost surely, 2^699077221 is an apocalyptic number.

It is an amenable number.

699077221 is a deficient number, since it is larger than the sum of its proper divisors (1).

699077221 is an equidigital number, since it uses as much as digits as its factorization.

699077221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 699077221 is about 26440.0684757056. The cubic root of 699077221 is about 887.5136686647.

The spelling of 699077221 in words is "six hundred ninety-nine million, seventy-seven thousand, two hundred twenty-one".