42241987 has 2 divisors, whose sum is σ = 42241988. Its totient is φ = 42241986.

The previous prime is 42241967. The next prime is 42242017. The reversal of 42241987 is 78914224.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42241987 is a prime.

It is not a weakly prime, because it can be changed into another prime (42241967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21120993 + 21120994.

It is an arithmetic number, because the mean of its divisors is an integer number (21120994).

Almost surely, 2^42241987 is an apocalyptic number.

42241987 is a deficient number, since it is larger than the sum of its proper divisors (1).

42241987 is an equidigital number, since it uses as much as digits as its factorization.

42241987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 42241987 is about 6499.3835861565. The cubic root of 42241987 is about 348.2689684167.

The spelling of 42241987 in words is "forty-two million, two hundred forty-one thousand, nine hundred eighty-seven".