645052241 has 8 divisors (see below), whose sum is σ = 661417704. Its totient is φ = 628842240.

The previous prime is 645052217. The next prime is 645052279. The reversal of 645052241 is 142250546.

It can be written as a sum of positive squares in 4 ways, for example, as 17048641 + 628003600 = 4129^2 + 25060^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645052241 - 2¹⁴ = 645035857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645051241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30440 + ... + 47081.

It is an arithmetic number, because the mean of its divisors is an integer number (82677213).

Almost surely, 2^645052241 is an apocalyptic number.

It is an amenable number.

645052241 is a deficient number, since it is larger than the sum of its proper divisors (16365463).

645052241 is a wasteful number, since it uses less digits than its factorization.

645052241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77731.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 645052241 is about 25397.8786712591. The cubic root of 645052241 is about 864.0355856864.

The spelling of 645052241 in words is "six hundred forty-five million, fifty-two thousand, two hundred forty-one".