623121431 has 2 divisors, whose sum is σ = 623121432. Its totient is φ = 623121430.

The previous prime is 623121413. The next prime is 623121439. The reversal of 623121431 is 134121326.

Together with previous prime (623121413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623121431 is a prime.

It is a super-2 number, since 2×623121431² = 776560635542975522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 623121397 and 623121406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623121439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311560715 + 311560716.

It is an arithmetic number, because the mean of its divisors is an integer number (311560716).

Almost surely, 2^623121431 is an apocalyptic number.

623121431 is a deficient number, since it is larger than the sum of its proper divisors (1).

623121431 is an equidigital number, since it uses as much as digits as its factorization.

623121431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 623121431 is about 24962.4003453194. The cubic root of 623121431 is about 854.1304982419.

Adding to 623121431 its reverse (134121326), we get a palindrome (757242757).

The spelling of 623121431 in words is "six hundred twenty-three million, one hundred twenty-one thousand, four hundred thirty-one".