691280713 has 4 divisors (see below), whose sum is σ = 692409028. Its totient is φ = 690152400.

The previous prime is 691280677. The next prime is 691280729. The reversal of 691280713 is 317082196.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2585664 + 688695049 = 1608^2 + 26243^2 .

It is a cyclic number.

It is not a de Polignac number, because 691280713 - 2²⁵ = 657726281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691280753) 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 in 3 ways as a sum of consecutive naturals, for example, 563238 + ... + 564463.

It is an arithmetic number, because the mean of its divisors is an integer number (173102257).

Almost surely, 2^691280713 is an apocalyptic number.

It is an amenable number.

691280713 is a deficient number, since it is larger than the sum of its proper divisors (1128315).

691280713 is a wasteful number, since it uses less digits than its factorization.

691280713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128314.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 691280713 is about 26292.2177269244. The cubic root of 691280713 is about 884.2019737548.

The spelling of 691280713 in words is "six hundred ninety-one million, two hundred eighty thousand, seven hundred thirteen".