691449063 has 4 divisors (see below), whose sum is σ = 921932088. Its totient is φ = 460966040.

The previous prime is 691449029. The next prime is 691449103. The reversal of 691449063 is 360944196.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 691449063 - 2¹⁸ = 691186919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691449163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115241508 + ... + 115241513.

It is an arithmetic number, because the mean of its divisors is an integer number (230483022).

Almost surely, 2^691449063 is an apocalyptic number.

691449063 is a deficient number, since it is larger than the sum of its proper divisors (230483025).

691449063 is a wasteful number, since it uses less digits than its factorization.

691449063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230483024.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 691449063 is about 26295.4190497128. The cubic root of 691449063 is about 884.2737455244.

The spelling of 691449063 in words is "six hundred ninety-one million, four hundred forty-nine thousand, sixty-three".