641559843 has 24 divisors (see below), whose sum is σ = 949170768. Its totient is φ = 417457152.

The previous prime is 641559839. The next prime is 641559847. The reversal of 641559843 is 348955146.

641559843 is a `hidden beast` number, since 6 + 4 + 15 + 598 + 43 = 666.

It is an interprime number because it is at equal distance from previous prime (641559839) and next prime (641559847).

It is not a de Polignac number, because 641559843 - 2² = 641559839 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641559847) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58696 + ... + 68762.

It is an arithmetic number, because the mean of its divisors is an integer number (39548782).

Almost surely, 2^641559843 is an apocalyptic number.

641559843 is a deficient number, since it is larger than the sum of its proper divisors (307610925).

641559843 is a wasteful number, since it uses less digits than its factorization.

641559843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10243 (or 10240 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 641559843 is about 25329.0316238107. The cubic root of 641559843 is about 862.4734287971.

The spelling of 641559843 in words is "six hundred forty-one million, five hundred fifty-nine thousand, eight hundred forty-three".