691479253 has 2 divisors, whose sum is σ = 691479254. Its totient is φ = 691479252.

The previous prime is 691479251. The next prime is 691479263. The reversal of 691479253 is 352974196.

It is a happy number.

691479253 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390734289 + 300744964 = 19767^2 + 17342^2 .

It is a cyclic number.

It is not a de Polignac number, because 691479253 - 2¹ = 691479251 is a prime.

Together with 691479251, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691479251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345739626 + 345739627.

It is an arithmetic number, because the mean of its divisors is an integer number (345739627).

Almost surely, 2^691479253 is an apocalyptic number.

It is an amenable number.

691479253 is a deficient number, since it is larger than the sum of its proper divisors (1).

691479253 is an equidigital number, since it uses as much as digits as its factorization.

691479253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 46.

The square root of 691479253 is about 26295.9930978086. The cubic root of 691479253 is about 884.2866150363.

It can be divided in two parts, 69147 and 9253, that added together give a square (78400 = 280²).

The spelling of 691479253 in words is "six hundred ninety-one million, four hundred seventy-nine thousand, two hundred fifty-three".