626242469 has 2 divisors, whose sum is σ = 626242470. Its totient is φ = 626242468.

The previous prime is 626242457. The next prime is 626242471. The reversal of 626242469 is 964242626.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 550465444 + 75777025 = 23462^2 + 8705^2 .

It is a cyclic number.

It is not a de Polignac number, because 626242469 - 2²⁰ = 625193893 is a prime.

It is a super-2 number, since 2×626242469² = 784359259958431922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 626242471, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (626242499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313121234 + 313121235.

It is an arithmetic number, because the mean of its divisors is an integer number (313121235).

Almost surely, 2^626242469 is an apocalyptic number.

It is an amenable number.

626242469 is a deficient number, since it is larger than the sum of its proper divisors (1).

626242469 is an equidigital number, since it uses as much as digits as its factorization.

626242469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 41.

The square root of 626242469 is about 25024.8370424265. The cubic root of 626242469 is about 855.5541562173.

The spelling of 626242469 in words is "six hundred twenty-six million, two hundred forty-two thousand, four hundred sixty-nine".