694645813 has 2 divisors, whose sum is σ = 694645814. Its totient is φ = 694645812.

The previous prime is 694645771. The next prime is 694645817. The reversal of 694645813 is 318546496.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 489382884 + 205262929 = 22122^2 + 14327^2 .

It is a cyclic number.

It is not a de Polignac number, because 694645813 - 2²⁹ = 157774901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (694645817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347322906 + 347322907.

It is an arithmetic number, because the mean of its divisors is an integer number (347322907).

Almost surely, 2^694645813 is an apocalyptic number.

It is an amenable number.

694645813 is a deficient number, since it is larger than the sum of its proper divisors (1).

694645813 is an equidigital number, since it uses as much as digits as its factorization.

694645813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 46.

The square root of 694645813 is about 26356.1342575120. The cubic root of 694645813 is about 885.6343937887.

The spelling of 694645813 in words is "six hundred ninety-four million, six hundred forty-five thousand, eight hundred thirteen".