625445641 has 2 divisors, whose sum is σ = 625445642. Its totient is φ = 625445640.

The previous prime is 625445617. The next prime is 625445659. The reversal of 625445641 is 146544526.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 616082041 + 9363600 = 24821^2 + 3060^2 .

It is a cyclic number.

It is not a de Polignac number, because 625445641 - 2²¹ = 623348489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 625445641.

It is not a weakly prime, because it can be changed into another prime (625445671) 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, 312722820 + 312722821.

It is an arithmetic number, because the mean of its divisors is an integer number (312722821).

Almost surely, 2^625445641 is an apocalyptic number.

It is an amenable number.

625445641 is a deficient number, since it is larger than the sum of its proper divisors (1).

625445641 is an equidigital number, since it uses as much as digits as its factorization.

625445641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 115200, while the sum is 37.

The square root of 625445641 is about 25008.9112317990. The cubic root of 625445641 is about 855.1911344972.

The spelling of 625445641 in words is "six hundred twenty-five million, four hundred forty-five thousand, six hundred forty-one".