626209481 has 2 divisors, whose sum is σ = 626209482. Its totient is φ = 626209480.

The previous prime is 626209471. The next prime is 626209487. The reversal of 626209481 is 184902626.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 619213456 + 6996025 = 24884^2 + 2645^2 .

It is a cyclic number.

It is not a de Polignac number, because 626209481 - 2¹⁸ = 625947337 is a prime.

It is a super-2 number, since 2×626209481² = 784276628188578722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (626209487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313104740 + 313104741.

It is an arithmetic number, because the mean of its divisors is an integer number (313104741).

Almost surely, 2^626209481 is an apocalyptic number.

It is an amenable number.

626209481 is a deficient number, since it is larger than the sum of its proper divisors (1).

626209481 is an equidigital number, since it uses as much as digits as its factorization.

626209481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 626209481 is about 25024.1779285554. The cubic root of 626209481 is about 855.5391335397.

The spelling of 626209481 in words is "six hundred twenty-six million, two hundred nine thousand, four hundred eighty-one".