442017491 has 2 divisors, whose sum is σ = 442017492. Its totient is φ = 442017490.

The previous prime is 442017481. The next prime is 442017497. The reversal of 442017491 is 194710244.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442017491 is a prime.

It is not a weakly prime, because it can be changed into another prime (442017497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221008745 + 221008746.

It is an arithmetic number, because the mean of its divisors is an integer number (221008746).

Almost surely, 2^442017491 is an apocalyptic number.

442017491 is a deficient number, since it is larger than the sum of its proper divisors (1).

442017491 is an equidigital number, since it uses as much as digits as its factorization.

442017491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 442017491 is about 21024.2120185276. The cubic root of 442017491 is about 761.7512081516.

The spelling of 442017491 in words is "four hundred forty-two million, seventeen thousand, four hundred ninety-one".