42643801 has 2 divisors, whose sum is σ = 42643802. Its totient is φ = 42643800.

The previous prime is 42643793. The next prime is 42643829. The reversal of 42643801 is 10834624.

It is an a-pointer prime, because the next prime (42643829) can be obtained adding 42643801 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42562576 + 81225 = 6524^2 + 285^2 .

It is a cyclic number.

It is not a de Polignac number, because 42643801 - 2³ = 42643793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42643801.

It is not a weakly prime, because it can be changed into another prime (42643001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21321900 + 21321901.

It is an arithmetic number, because the mean of its divisors is an integer number (21321901).

Almost surely, 2^42643801 is an apocalyptic number.

It is an amenable number.

42643801 is a deficient number, since it is larger than the sum of its proper divisors (1).

42643801 is an equidigital number, since it uses as much as digits as its factorization.

42643801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 42643801 is about 6530.2221248592. Note that the first 3 decimals coincide. The cubic root of 42643801 is about 349.3697528662.

The spelling of 42643801 in words is "forty-two million, six hundred forty-three thousand, eight hundred one".