691931453 has 2 divisors, whose sum is σ = 691931454. Its totient is φ = 691931452.

The previous prime is 691931437. The next prime is 691931477. The reversal of 691931453 is 354139196.

691931453 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., 664505284 + 27426169 = 25778^2 + 5237^2 .

It is a cyclic number.

It is not a de Polignac number, because 691931453 - 2⁴ = 691931437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 691931453.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691901453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345965726 + 345965727.

It is an arithmetic number, because the mean of its divisors is an integer number (345965727).

Almost surely, 2^691931453 is an apocalyptic number.

It is an amenable number.

691931453 is a deficient number, since it is larger than the sum of its proper divisors (1).

691931453 is an equidigital number, since it uses as much as digits as its factorization.

691931453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 41.

The square root of 691931453 is about 26304.5899606894. The cubic root of 691931453 is about 884.4793358205.

The spelling of 691931453 in words is "six hundred ninety-one million, nine hundred thirty-one thousand, four hundred fifty-three".