625405423 has 2 divisors, whose sum is σ = 625405424. Its totient is φ = 625405422.

The previous prime is 625405421. The next prime is 625405427. The reversal of 625405423 is 324504526.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 625405423 - 2¹ = 625405421 is a prime.

It is a super-2 number, since 2×625405423² = 782263886235617858, which contains 22 as substring.

Together with 625405421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625405421) 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, 312702711 + 312702712.

It is an arithmetic number, because the mean of its divisors is an integer number (312702712).

Almost surely, 2^625405423 is an apocalyptic number.

625405423 is a deficient number, since it is larger than the sum of its proper divisors (1).

625405423 is an equidigital number, since it uses as much as digits as its factorization.

625405423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 31.

The square root of 625405423 is about 25008.1071454838. The cubic root of 625405423 is about 855.1728036666.

Adding to 625405423 its reverse (324504526), we get a palindrome (949909949).

The spelling of 625405423 in words is "six hundred twenty-five million, four hundred five thousand, four hundred twenty-three".