423021531 has 8 divisors (see below), whose sum is σ = 564125200. Its totient is φ = 281966112.

The previous prime is 423021509. The next prime is 423021569. The reversal of 423021531 is 135120324.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 423021531 - 2⁵ = 423021499 is a prime.

It is a super-2 number, since 2×423021531² = 357894431379167922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 423021498 and 423021507.

It is not an unprimeable number, because it can be changed into a prime (423021631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22761 + ... + 36933.

It is an arithmetic number, because the mean of its divisors is an integer number (70515650).

Almost surely, 2^423021531 is an apocalyptic number.

423021531 is a deficient number, since it is larger than the sum of its proper divisors (141103669).

423021531 is a wasteful number, since it uses less digits than its factorization.

423021531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24125.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 423021531 is about 20567.4872310645. The cubic root of 423021531 is about 750.6788112129.

Adding to 423021531 its reverse (135120324), we get a palindrome (558141855).

The spelling of 423021531 in words is "four hundred twenty-three million, twenty-one thousand, five hundred thirty-one".