423115531 has 4 divisors (see below), whose sum is σ = 433435464. Its totient is φ = 412795600.

The previous prime is 423115513. The next prime is 423115603. The reversal of 423115531 is 135511324.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 423115531 - 2⁷ = 423115403 is a prime.

It is a super-2 number, since 2×423115531² = 358053505146823922, 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 = 423115496 and 423115505.

It is not an unprimeable number, because it can be changed into a prime (423115501) 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, 5159905 + ... + 5159986.

It is an arithmetic number, because the mean of its divisors is an integer number (108358866).

Almost surely, 2^423115531 is an apocalyptic number.

423115531 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

423115531 is a deficient number, since it is larger than the sum of its proper divisors (10319933).

423115531 is a wasteful number, since it uses less digits than its factorization.

423115531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10319932.

The product of its digits is 1800, while the sum is 25.

The square root of 423115531 is about 20569.7722641744. The cubic root of 423115531 is about 750.7344101025.

Adding to 423115531 its reverse (135511324), we get a palindrome (558626855).

The spelling of 423115531 in words is "four hundred twenty-three million, one hundred fifteen thousand, five hundred thirty-one".