641747841 has 32 divisors (see below), whose sum is σ = 1040117760. Its totient is φ = 343577856.

The previous prime is 641747837. The next prime is 641747851. The reversal of 641747841 is 148747146.

It is not a de Polignac number, because 641747841 - 2² = 641747837 is a prime.

It is a super-2 number, since 2×641747841² = 823680582856322562, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 641747793 and 641747802.

It is not an unprimeable number, because it can be changed into a prime (641747851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77080 + ... + 84998.

It is an arithmetic number, because the mean of its divisors is an integer number (32503680).

Almost surely, 2^641747841 is an apocalyptic number.

It is an amenable number.

641747841 is a deficient number, since it is larger than the sum of its proper divisors (398369919).

641747841 is a wasteful number, since it uses less digits than its factorization.

641747841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8173.

The product of its digits is 150528, while the sum is 42.

The square root of 641747841 is about 25332.7424689867. The cubic root of 641747841 is about 862.5576648696.

The spelling of 641747841 in words is "six hundred forty-one million, seven hundred forty-seven thousand, eight hundred forty-one".