691241 has 2 divisors, whose sum is σ = 691242. Its totient is φ = 691240.

The previous prime is 691231. The next prime is 691267. The reversal of 691241 is 142196.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 547600 + 143641 = 740^2 + 379^2 .

It is a cyclic number.

It is not a de Polignac number, because 691241 - 2¹⁴ = 674857 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691241.

It is not a weakly prime, because it can be changed into another prime (691231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345620 + 345621.

It is an arithmetic number, because the mean of its divisors is an integer number (345621).

2⁶⁹¹²⁴¹ is an apocalyptic number.

It is an amenable number.

691241 is a deficient number, since it is larger than the sum of its proper divisors (1).

691241 is an equidigital number, since it uses as much as digits as its factorization.

691241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 23.

The square root of 691241 is about 831.4090449352. The cubic root of 691241 is about 88.4185041422.

The spelling of 691241 in words is "six hundred ninety-one thousand, two hundred forty-one".