691262741 has 4 divisors (see below), whose sum is σ = 744436812. Its totient is φ = 638088672.

The previous prime is 691262701. The next prime is 691262773. The reversal of 691262741 is 147262196.

691262741 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 467640625 + 223622116 = 21625^2 + 14954^2 .

It is a de Polignac number, because none of the positive numbers 2^k-691262741 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 691262695 and 691262704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691262701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26587016 + ... + 26587041.

It is an arithmetic number, because the mean of its divisors is an integer number (186109203).

Almost surely, 2^691262741 is an apocalyptic number.

It is an amenable number.

691262741 is a deficient number, since it is larger than the sum of its proper divisors (53174071).

691262741 is a wasteful number, since it uses less digits than its factorization.

691262741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53174070.

The product of its digits is 36288, while the sum is 38.

The square root of 691262741 is about 26291.8759505669. The cubic root of 691262741 is about 884.1943111583.

The spelling of 691262741 in words is "six hundred ninety-one million, two hundred sixty-two thousand, seven hundred forty-one".