420331812493 has 2 divisors, whose sum is σ = 420331812494. Its totient is φ = 420331812492.

The previous prime is 420331812473. The next prime is 420331812539. The reversal of 420331812493 is 394218133024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 420211208169 + 120604324 = 648237^2 + 10982^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420331812493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420331812463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210165906246 + 210165906247.

It is an arithmetic number, because the mean of its divisors is an integer number (210165906247).

Almost surely, 2^420331812493 is an apocalyptic number.

It is an amenable number.

420331812493 is a deficient number, since it is larger than the sum of its proper divisors (1).

420331812493 is an equidigital number, since it uses as much as digits as its factorization.

420331812493 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 40.

The spelling of 420331812493 in words is "four hundred twenty billion, three hundred thirty-one million, eight hundred twelve thousand, four hundred ninety-three".