691047067 has 2 divisors, whose sum is σ = 691047068. Its totient is φ = 691047066.

The previous prime is 691047013. The next prime is 691047083. The reversal of 691047067 is 760740196.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691047067 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (691047667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345523533 + 345523534.

It is an arithmetic number, because the mean of its divisors is an integer number (345523534).

Almost surely, 2^691047067 is an apocalyptic number.

691047067 is a deficient number, since it is larger than the sum of its proper divisors (1).

691047067 is an equidigital number, since it uses as much as digits as its factorization.

691047067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 691047067 is about 26287.7740974773. The cubic root of 691047067 is about 884.1023453743.

The spelling of 691047067 in words is "six hundred ninety-one million, forty-seven thousand, sixty-seven".