694441861 has 2 divisors, whose sum is σ = 694441862. Its totient is φ = 694441860.

The previous prime is 694441843. The next prime is 694441883. The reversal of 694441861 is 168144496.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659513761 + 34928100 = 25681^2 + 5910^2 .

It is a cyclic number.

It is not a de Polignac number, because 694441861 - 2¹³ = 694433669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (694441361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347220930 + 347220931.

It is an arithmetic number, because the mean of its divisors is an integer number (347220931).

Almost surely, 2^694441861 is an apocalyptic number.

It is an amenable number.

694441861 is a deficient number, since it is larger than the sum of its proper divisors (1).

694441861 is an equidigital number, since it uses as much as digits as its factorization.

694441861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 43.

The square root of 694441861 is about 26352.2648172790. The cubic root of 694441861 is about 885.5477095231.

The spelling of 694441861 in words is "six hundred ninety-four million, four hundred forty-one thousand, eight hundred sixty-one".