641320453 has 2 divisors, whose sum is σ = 641320454. Its totient is φ = 641320452.

The previous prime is 641320441. The next prime is 641320457. The reversal of 641320453 is 354023146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 492529249 + 148791204 = 22193^2 + 12198^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641320453 is a prime.

It is a super-2 number, since 2×641320453² = 822583846872250418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641320457) 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, 320660226 + 320660227.

It is an arithmetic number, because the mean of its divisors is an integer number (320660227).

Almost surely, 2^641320453 is an apocalyptic number.

It is an amenable number.

641320453 is a deficient number, since it is larger than the sum of its proper divisors (1).

641320453 is an equidigital number, since it uses as much as digits as its factorization.

641320453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 641320453 is about 25324.3055778436. The cubic root of 641320453 is about 862.3661417414.

Adding to 641320453 its reverse (354023146), we get a palindrome (995343599).

The spelling of 641320453 in words is "six hundred forty-one million, three hundred twenty thousand, four hundred fifty-three".