691460389 has 2 divisors, whose sum is σ = 691460390. Its totient is φ = 691460388.

The previous prime is 691460383. The next prime is 691460411. The reversal of 691460389 is 983064196.

691460389 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., 645668100 + 45792289 = 25410^2 + 6767^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691460389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691460383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345730194 + 345730195.

It is an arithmetic number, because the mean of its divisors is an integer number (345730195).

Almost surely, 2^691460389 is an apocalyptic number.

It is an amenable number.

691460389 is a deficient number, since it is larger than the sum of its proper divisors (1).

691460389 is an equidigital number, since it uses as much as digits as its factorization.

691460389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 691460389 is about 26295.6344095365. The cubic root of 691460389 is about 884.2785736601.

The spelling of 691460389 in words is "six hundred ninety-one million, four hundred sixty thousand, three hundred eighty-nine".