694377989 has 2 divisors, whose sum is σ = 694377990. Its totient is φ = 694377988.

The previous prime is 694377977. The next prime is 694377997. The reversal of 694377989 is 989773496.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 672987364 + 21390625 = 25942^2 + 4625^2 .

It is a cyclic number.

It is not a de Polignac number, because 694377989 - 2⁴ = 694377973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (694377949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347188994 + 347188995.

It is an arithmetic number, because the mean of its divisors is an integer number (347188995).

Almost surely, 2^694377989 is an apocalyptic number.

It is an amenable number.

694377989 is a deficient number, since it is larger than the sum of its proper divisors (1).

694377989 is an equidigital number, since it uses as much as digits as its factorization.

694377989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20575296, while the sum is 62.

The square root of 694377989 is about 26351.0529011651. The cubic root of 694377989 is about 885.5205589721.

The spelling of 694377989 in words is "six hundred ninety-four million, three hundred seventy-seven thousand, nine hundred eighty-nine".