691363 has 2 divisors, whose sum is σ = 691364. Its totient is φ = 691362.

The previous prime is 691349. The next prime is 691381. The reversal of 691363 is 363196.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691363 is a prime.

It is not a weakly prime, because it can be changed into another prime (691333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345681 + 345682.

It is an arithmetic number, because the mean of its divisors is an integer number (345682).

2⁶⁹¹³⁶³ is an apocalyptic number.

691363 is a deficient number, since it is larger than the sum of its proper divisors (1).

691363 is an equidigital number, since it uses as much as digits as its factorization.

691363 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 28.

The square root of 691363 is about 831.4824111188. The cubic root of 691363 is about 88.4237056194.

The spelling of 691363 in words is "six hundred ninety-one thousand, three hundred sixty-three".