420896491 has 2 divisors, whose sum is σ = 420896492. Its totient is φ = 420896490.

The previous prime is 420896477. The next prime is 420896507. The reversal of 420896491 is 194698024.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420896491 is a prime.

It is a super-2 number, since 2×420896491² = 354307712272226162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (420896431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210448245 + 210448246.

It is an arithmetic number, because the mean of its divisors is an integer number (210448246).

Almost surely, 2^420896491 is an apocalyptic number.

420896491 is a deficient number, since it is larger than the sum of its proper divisors (1).

420896491 is an equidigital number, since it uses as much as digits as its factorization.

420896491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 420896491 is about 20515.7620136323. The cubic root of 420896491 is about 749.4196939238.

The spelling of 420896491 in words is "four hundred twenty million, eight hundred ninety-six thousand, four hundred ninety-one".