625505549 has 2 divisors, whose sum is σ = 625505550. Its totient is φ = 625505548.

The previous prime is 625505533. The next prime is 625505557. The reversal of 625505549 is 945505526.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 414733225 + 210772324 = 20365^2 + 14518^2 .

It is a cyclic number.

It is not a de Polignac number, because 625505549 - 2⁴ = 625505533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625505579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312752774 + 312752775.

It is an arithmetic number, because the mean of its divisors is an integer number (312752775).

Almost surely, 2^625505549 is an apocalyptic number.

It is an amenable number.

625505549 is a deficient number, since it is larger than the sum of its proper divisors (1).

625505549 is an equidigital number, since it uses as much as digits as its factorization.

625505549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270000, while the sum is 41.

The square root of 625505549 is about 25010.1089361882. The cubic root of 625505549 is about 855.2184383114.

The spelling of 625505549 in words is "six hundred twenty-five million, five hundred five thousand, five hundred forty-nine".