691358963 has 2 divisors, whose sum is σ = 691358964. Its totient is φ = 691358962.

The previous prime is 691358953. The next prime is 691358981. The reversal of 691358963 is 369853196.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691358963 is a prime.

It is not a weakly prime, because it can be changed into another prime (691358903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345679481 + 345679482.

It is an arithmetic number, because the mean of its divisors is an integer number (345679482).

Almost surely, 2^691358963 is an apocalyptic number.

691358963 is a deficient number, since it is larger than the sum of its proper divisors (1).

691358963 is an equidigital number, since it uses as much as digits as its factorization.

691358963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 50.

The square root of 691358963 is about 26293.7057677308. The cubic root of 691358963 is about 884.2353351147.

The spelling of 691358963 in words is "six hundred ninety-one million, three hundred fifty-eight thousand, nine hundred sixty-three".