42581963 has 2 divisors, whose sum is σ = 42581964. Its totient is φ = 42581962.

The previous prime is 42581939. The next prime is 42581969. The reversal of 42581963 is 36918524.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42581963 - 2¹⁰ = 42580939 is a prime.

It is not a weakly prime, because it can be changed into another prime (42581969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21290981 + 21290982.

It is an arithmetic number, because the mean of its divisors is an integer number (21290982).

Almost surely, 2^42581963 is an apocalyptic number.

42581963 is a deficient number, since it is larger than the sum of its proper divisors (1).

42581963 is an equidigital number, since it uses as much as digits as its factorization.

42581963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 42581963 is about 6525.4856524247. The cubic root of 42581963 is about 349.2007968668.

The spelling of 42581963 in words is "forty-two million, five hundred eighty-one thousand, nine hundred sixty-three".