644183041 has 8 divisors (see below), whose sum is σ = 657153000. Its totient is φ = 631243392.

The previous prime is 644183039. The next prime is 644183047. The reversal of 644183041 is 140381446.

It can be written as a sum of positive squares in 4 ways, for example, as 78694641 + 565488400 = 8871^2 + 23780^2 .

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 644183041 - 2¹ = 644183039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 644182994 and 644183012.

It is not an unprimeable number, because it can be changed into a prime (644183047) 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, 38085 + ... + 52333.

It is an arithmetic number, because the mean of its divisors is an integer number (82144125).

Almost surely, 2^644183041 is an apocalyptic number.

It is an amenable number.

644183041 is a deficient number, since it is larger than the sum of its proper divisors (12969959).

644183041 is a wasteful number, since it uses less digits than its factorization.

644183041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15155.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 644183041 is about 25380.7612375988. The cubic root of 644183041 is about 863.6473187802.

The spelling of 644183041 in words is "six hundred forty-four million, one hundred eighty-three thousand, forty-one".