691449256 has 16 divisors (see below), whose sum is σ = 1328089140. Its totient is φ = 337292160.

The previous prime is 691449221. The next prime is 691449257. The reversal of 691449256 is 652944196.

691449256 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 691164100 + 285156 = 26290^2 + 534^2 .

It is not an unprimeable number, because it can be changed into a prime (691449257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1053711 + ... + 1054366.

Almost surely, 2^691449256 is an apocalyptic number.

It is an amenable number.

691449256 is a deficient number, since it is larger than the sum of its proper divisors (636639884).

691449256 is a wasteful number, since it uses less digits than its factorization.

691449256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108124 (or 2108120 counting only the distinct ones).

The product of its digits is 466560, while the sum is 46.

The square root of 691449256 is about 26295.4227195533. The cubic root of 691449256 is about 884.2738277984.

It can be divided in two parts, 69144 and 9256, that added together give a square (78400 = 280²).

The spelling of 691449256 in words is "six hundred ninety-one million, four hundred forty-nine thousand, two hundred fifty-six".