694423409 has 2 divisors, whose sum is σ = 694423410. Its totient is φ = 694423408.

The previous prime is 694423397. The next prime is 694423417. The reversal of 694423409 is 904324496.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 467770384 + 226653025 = 21628^2 + 15055^2 .

It is a cyclic number.

It is not a de Polignac number, because 694423409 - 2²⁸ = 425987953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (694423459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347211704 + 347211705.

It is an arithmetic number, because the mean of its divisors is an integer number (347211705).

Almost surely, 2^694423409 is an apocalyptic number.

It is an amenable number.

694423409 is a deficient number, since it is larger than the sum of its proper divisors (1).

694423409 is an equidigital number, since it uses as much as digits as its factorization.

694423409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 41.

The square root of 694423409 is about 26351.9147122178. The cubic root of 694423409 is about 885.5398661638.

The spelling of 694423409 in words is "six hundred ninety-four million, four hundred twenty-three thousand, four hundred nine".