625686749 has 2 divisors, whose sum is σ = 625686750. Its totient is φ = 625686748.

The previous prime is 625686727. The next prime is 625686791. The reversal of 625686749 is 947686526.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 610979524 + 14707225 = 24718^2 + 3835^2 .

It is a cyclic number.

It is not a de Polignac number, because 625686749 - 2¹² = 625682653 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 625686749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625686449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312843374 + 312843375.

It is an arithmetic number, because the mean of its divisors is an integer number (312843375).

Almost surely, 2^625686749 is an apocalyptic number.

It is an amenable number.

625686749 is a deficient number, since it is larger than the sum of its proper divisors (1).

625686749 is an equidigital number, since it uses as much as digits as its factorization.

625686749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 53.

The square root of 625686749 is about 25013.7312090779. The cubic root of 625686749 is about 855.3010118500.

The spelling of 625686749 in words is "six hundred twenty-five million, six hundred eighty-six thousand, seven hundred forty-nine".