42643501 has 2 divisors, whose sum is σ = 42643502. Its totient is φ = 42643500.

The previous prime is 42643483. The next prime is 42643519. The reversal of 42643501 is 10534624.

It is a balanced prime because it is at equal distance from previous prime (42643483) and next prime (42643519).

It can be written as a sum of positive squares in only one way, i.e., 42640900 + 2601 = 6530^2 + 51^2 .

It is a cyclic number.

It is not a de Polignac number, because 42643501 - 2⁷ = 42643373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42643591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21321750 + 21321751.

It is an arithmetic number, because the mean of its divisors is an integer number (21321751).

Almost surely, 2^42643501 is an apocalyptic number.

It is an amenable number.

42643501 is a deficient number, since it is larger than the sum of its proper divisors (1).

42643501 is an equidigital number, since it uses as much as digits as its factorization.

42643501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 42643501 is about 6530.1991546966. The cubic root of 42643501 is about 349.3689335898.

The spelling of 42643501 in words is "forty-two million, six hundred forty-three thousand, five hundred one".