424521491 has 2 divisors, whose sum is σ = 424521492. Its totient is φ = 424521490.

The previous prime is 424521481. The next prime is 424521521. The reversal of 424521491 is 194125424.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-424521491 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (424521481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212260745 + 212260746.

It is an arithmetic number, because the mean of its divisors is an integer number (212260746).

Almost surely, 2^424521491 is an apocalyptic number.

424521491 is a deficient number, since it is larger than the sum of its proper divisors (1).

424521491 is an equidigital number, since it uses as much as digits as its factorization.

424521491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The square root of 424521491 is about 20603.9193116261. The cubic root of 424521491 is about 751.5650229623.

The spelling of 424521491 in words is "four hundred twenty-four million, five hundred twenty-one thousand, four hundred ninety-one".