423147281 has 4 divisors (see below), whose sum is σ = 434583732. Its totient is φ = 411710832.

The previous prime is 423147269. The next prime is 423147287. The reversal of 423147281 is 182741324.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 212897281 + 210250000 = 14591^2 + 14500^2 .

It is a cyclic number.

It is not a de Polignac number, because 423147281 - 2⁶ = 423147217 is a prime.

It is a super-2 number, since 2×423147281² = 358107242835385922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (423147287) 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, 5718170 + ... + 5718243.

It is an arithmetic number, because the mean of its divisors is an integer number (108645933).

Almost surely, 2^423147281 is an apocalyptic number.

It is an amenable number.

423147281 is a deficient number, since it is larger than the sum of its proper divisors (11436451).

423147281 is a wasteful number, since it uses less digits than its factorization.

423147281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11436450.

The product of its digits is 10752, while the sum is 32.

The square root of 423147281 is about 20570.5440132243. The cubic root of 423147281 is about 750.7531876542.

The spelling of 423147281 in words is "four hundred twenty-three million, one hundred forty-seven thousand, two hundred eighty-one".