423138631 has 2 divisors, whose sum is σ = 423138632. Its totient is φ = 423138630.

The previous prime is 423138601. The next prime is 423138641. The reversal of 423138631 is 136831324.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 423138631 - 2⁹ = 423138119 is a prime.

It is a super-2 number, since 2×423138631² = 358092602089108322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 423138593 and 423138602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423138601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211569315 + 211569316.

It is an arithmetic number, because the mean of its divisors is an integer number (211569316).

Almost surely, 2^423138631 is an apocalyptic number.

423138631 is a deficient number, since it is larger than the sum of its proper divisors (1).

423138631 is an equidigital number, since it uses as much as digits as its factorization.

423138631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 31.

The square root of 423138631 is about 20570.3337600536. Note that the first 3 decimals coincide. The cubic root of 423138631 is about 750.7480719734.

Adding to 423138631 its reverse (136831324), we get a palindrome (559969955).

The spelling of 423138631 in words is "four hundred twenty-three million, one hundred thirty-eight thousand, six hundred thirty-one".