420981408173 has 4 divisors (see below), whose sum is σ = 422092177440. Its totient is φ = 419870638908.

The previous prime is 420981408121. The next prime is 420981408187. The reversal of 420981408173 is 371804189024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 420981408173 - 2¹⁶ = 420981342637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420981408103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555384065 + ... + 555384822.

It is an arithmetic number, because the mean of its divisors is an integer number (105523044360).

Almost surely, 2^420981408173 is an apocalyptic number.

It is an amenable number.

420981408173 is a deficient number, since it is larger than the sum of its proper divisors (1110769267).

420981408173 is a wasteful number, since it uses less digits than its factorization.

420981408173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110769266.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 420981408173 in words is "four hundred twenty billion, nine hundred eighty-one million, four hundred eight thousand, one hundred seventy-three".