691713149 has 2 divisors, whose sum is σ = 691713150. Its totient is φ = 691713148.

The previous prime is 691713097. The next prime is 691713161. The reversal of 691713149 is 941317196.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 470239225 + 221473924 = 21685^2 + 14882^2 .

It is a cyclic number.

It is not a de Polignac number, because 691713149 - 2¹⁶ = 691647613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691713749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345856574 + 345856575.

It is an arithmetic number, because the mean of its divisors is an integer number (345856575).

Almost surely, 2^691713149 is an apocalyptic number.

It is an amenable number.

691713149 is a deficient number, since it is larger than the sum of its proper divisors (1).

691713149 is an equidigital number, since it uses as much as digits as its factorization.

691713149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 691713149 is about 26300.4400913749. The cubic root of 691713149 is about 884.3863084521.

The spelling of 691713149 in words is "six hundred ninety-one million, seven hundred thirteen thousand, one hundred forty-nine".