42681547 has 2 divisors, whose sum is σ = 42681548. Its totient is φ = 42681546.

The previous prime is 42681539. The next prime is 42681557. The reversal of 42681547 is 74518624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42681547 - 2³ = 42681539 is a prime.

It is not a weakly prime, because it can be changed into another prime (42681557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21340773 + 21340774.

It is an arithmetic number, because the mean of its divisors is an integer number (21340774).

Almost surely, 2^42681547 is an apocalyptic number.

42681547 is a deficient number, since it is larger than the sum of its proper divisors (1).

42681547 is an equidigital number, since it uses as much as digits as its factorization.

42681547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 37.

The square root of 42681547 is about 6533.1115863729. Note that the first 3 decimals coincide. The cubic root of 42681547 is about 349.4728035746.

The spelling of 42681547 in words is "forty-two million, six hundred eighty-one thousand, five hundred forty-seven".