691927867 has 2 divisors, whose sum is σ = 691927868. Its totient is φ = 691927866.

The previous prime is 691927783. The next prime is 691927889. The reversal of 691927867 is 768729196.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 691927867 - 2⁷ = 691927739 is a prime.

It is not a weakly prime, because it can be changed into another prime (691927367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345963933 + 345963934.

It is an arithmetic number, because the mean of its divisors is an integer number (345963934).

Almost surely, 2^691927867 is an apocalyptic number.

691927867 is a deficient number, since it is larger than the sum of its proper divisors (1).

691927867 is an equidigital number, since it uses as much as digits as its factorization.

691927867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 55.

The square root of 691927867 is about 26304.5217975921. The cubic root of 691927867 is about 884.4778078520.

The spelling of 691927867 in words is "six hundred ninety-one million, nine hundred twenty-seven thousand, eight hundred sixty-seven".