42818641 has 2 divisors, whose sum is σ = 42818642. Its totient is φ = 42818640.

The previous prime is 42818639. The next prime is 42818681. The reversal of 42818641 is 14681824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42185025 + 633616 = 6495^2 + 796^2 .

It is a cyclic number.

It is not a de Polignac number, because 42818641 - 2¹ = 42818639 is a prime.

Together with 42818639, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 42818597 and 42818606.

It is not a weakly prime, because it can be changed into another prime (42818681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21409320 + 21409321.

It is an arithmetic number, because the mean of its divisors is an integer number (21409321).

Almost surely, 2^42818641 is an apocalyptic number.

It is an amenable number.

42818641 is a deficient number, since it is larger than the sum of its proper divisors (1).

42818641 is an equidigital number, since it uses as much as digits as its factorization.

42818641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12288, while the sum is 34.

The square root of 42818641 is about 6543.5954184225. The cubic root of 42818641 is about 349.8465749317.

The spelling of 42818641 in words is "forty-two million, eight hundred eighteen thousand, six hundred forty-one".