694191321 has 6 divisors (see below), whose sum is σ = 1002720810. Its totient is φ = 462794208.

The previous prime is 694191317. The next prime is 694191343. The reversal of 694191321 is 123191496.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 687488400 + 6702921 = 26220^2 + 2589^2 .

It is not a de Polignac number, because 694191321 - 2² = 694191317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (694121321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38566176 + ... + 38566193.

It is an arithmetic number, because the mean of its divisors is an integer number (167120135).

Almost surely, 2^694191321 is an apocalyptic number.

It is an amenable number.

694191321 is a deficient number, since it is larger than the sum of its proper divisors (308529489).

694191321 is a wasteful number, since it uses less digits than its factorization.

694191321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77132375 (or 77132372 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 694191321 is about 26347.5107173334. The cubic root of 694191321 is about 885.4412010581.

The spelling of 694191321 in words is "six hundred ninety-four million, one hundred ninety-one thousand, three hundred twenty-one".