42533681 has 2 divisors, whose sum is σ = 42533682. Its totient is φ = 42533680.

The previous prime is 42533657. The next prime is 42533713. The reversal of 42533681 is 18633524.

It is an a-pointer prime, because the next prime (42533713) can be obtained adding 42533681 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39488656 + 3045025 = 6284^2 + 1745^2 .

It is a cyclic number.

It is not a de Polignac number, because 42533681 - 2¹⁴ = 42517297 is a prime.

It is a super-2 number, since 2×42533681² = 3618228038819522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42533611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21266840 + 21266841.

It is an arithmetic number, because the mean of its divisors is an integer number (21266841).

Almost surely, 2^42533681 is an apocalyptic number.

It is an amenable number.

42533681 is a deficient number, since it is larger than the sum of its proper divisors (1).

42533681 is an equidigital number, since it uses as much as digits as its factorization.

42533681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 32.

The square root of 42533681 is about 6521.7851083887. The cubic root of 42533681 is about 349.0687653050.

The spelling of 42533681 in words is "forty-two million, five hundred thirty-three thousand, six hundred eighty-one".