1645680241 has 2 divisors, whose sum is σ = 1645680242. Its totient is φ = 1645680240.

The previous prime is 1645680227. The next prime is 1645680287. The reversal of 1645680241 is 1420865461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1600320016 + 45360225 = 40004^2 + 6735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1645680241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1645680241.

It is not a weakly prime, because it can be changed into another prime (1645680541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822840120 + 822840121.

It is an arithmetic number, because the mean of its divisors is an integer number (822840121).

Almost surely, 2^1645680241 is an apocalyptic number.

It is an amenable number.

1645680241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645680241 is an equidigital number, since it uses as much as digits as its factorization.

1645680241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 1645680241 is about 40566.9846180364. The cubic root of 1645680241 is about 1180.6336348415.

The spelling of 1645680241 in words is "one billion, six hundred forty-five million, six hundred eighty thousand, two hundred forty-one".