423621031 has 2 divisors, whose sum is σ = 423621032. Its totient is φ = 423621030.

The previous prime is 423621013. The next prime is 423621053. The reversal of 423621031 is 130126324.

Together with previous prime (423621013) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (423621053) can be obtained adding 423621031 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423621031 is a prime.

It is a super-2 number, since 2×423621031² = 358909555811005922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 423620993 and 423621011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423621071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211810515 + 211810516.

It is an arithmetic number, because the mean of its divisors is an integer number (211810516).

Almost surely, 2^423621031 is an apocalyptic number.

423621031 is a deficient number, since it is larger than the sum of its proper divisors (1).

423621031 is an equidigital number, since it uses as much as digits as its factorization.

423621031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 423621031 is about 20582.0560440399. The cubic root of 423621031 is about 751.0332608793.

Adding to 423621031 its reverse (130126324), we get a palindrome (553747355).

The spelling of 423621031 in words is "four hundred twenty-three million, six hundred twenty-one thousand, thirty-one".