645524413 has 2 divisors, whose sum is σ = 645524414. Its totient is φ = 645524412.

The previous prime is 645524339. The next prime is 645524423. The reversal of 645524413 is 314425546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 552344004 + 93180409 = 23502^2 + 9653^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645524413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645524423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322762206 + 322762207.

It is an arithmetic number, because the mean of its divisors is an integer number (322762207).

Almost surely, 2^645524413 is an apocalyptic number.

It is an amenable number.

645524413 is a deficient number, since it is larger than the sum of its proper divisors (1).

645524413 is an equidigital number, since it uses as much as digits as its factorization.

645524413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 34.

The square root of 645524413 is about 25407.1724715679. The cubic root of 645524413 is about 864.2463561640.

Adding to 645524413 its reverse (314425546), we get a palindrome (959949959).

The spelling of 645524413 in words is "six hundred forty-five million, five hundred twenty-four thousand, four hundred thirteen".