691348241 has 2 divisors, whose sum is σ = 691348242. Its totient is φ = 691348240.

The previous prime is 691348223. The next prime is 691348243. The reversal of 691348241 is 142843196.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 646176400 + 45171841 = 25420^2 + 6721^2 .

It is a cyclic number.

It is not a de Polignac number, because 691348241 - 2¹⁴ = 691331857 is a prime.

Together with 691348243, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 691348195 and 691348204.

It is not a weakly prime, because it can be changed into another prime (691348243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345674120 + 345674121.

It is an arithmetic number, because the mean of its divisors is an integer number (345674121).

Almost surely, 2^691348241 is an apocalyptic number.

It is an amenable number.

691348241 is a deficient number, since it is larger than the sum of its proper divisors (1).

691348241 is an equidigital number, since it uses as much as digits as its factorization.

691348241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 691348241 is about 26293.5018778405. The cubic root of 691348241 is about 884.2307640112.

The spelling of 691348241 in words is "six hundred ninety-one million, three hundred forty-eight thousand, two hundred forty-one".