424673281 has 4 divisors (see below), whose sum is σ = 424714500. Its totient is φ = 424632064.

The previous prime is 424673273. The next prime is 424673317. The reversal of 424673281 is 182376424.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 353101681 + 71571600 = 18791^2 + 8460^2 .

It is a cyclic number.

It is not a de Polignac number, because 424673281 - 2³ = 424673273 is a prime.

It is a super-2 number, since 2×424673281² = 360694791190609922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 424673281.

It is not an unprimeable number, because it can be changed into a prime (424673261) 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, 9945 + ... + 30793.

It is an arithmetic number, because the mean of its divisors is an integer number (106178625).

It is a Proth number, since it is equal to 405 ⋅ 2²⁰ + 1 and 405 < 2²⁰.

Almost surely, 2^424673281 is an apocalyptic number.

It is an amenable number.

424673281 is a deficient number, since it is larger than the sum of its proper divisors (41219).

424673281 is a wasteful number, since it uses less digits than its factorization.

424673281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41218.

The product of its digits is 64512, while the sum is 37.

The square root of 424673281 is about 20607.6025049010. The cubic root of 424673281 is about 751.6545876944.

The spelling of 424673281 in words is "four hundred twenty-four million, six hundred seventy-three thousand, two hundred eighty-one".