691007047 has 2 divisors, whose sum is σ = 691007048. Its totient is φ = 691007046.

The previous prime is 691007021. The next prime is 691007059. The reversal of 691007047 is 740700196.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 691007047 - 2⁷ = 691006919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691007017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345503523 + 345503524.

It is an arithmetic number, because the mean of its divisors is an integer number (345503524).

Almost surely, 2^691007047 is an apocalyptic number.

691007047 is a deficient number, since it is larger than the sum of its proper divisors (1).

691007047 is an equidigital number, since it uses as much as digits as its factorization.

691007047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 691007047 is about 26287.0128961052. The cubic root of 691007047 is about 884.0852782980.

The spelling of 691007047 in words is "six hundred ninety-one million, seven thousand, forty-seven".