641952253 has 2 divisors, whose sum is σ = 641952254. Its totient is φ = 641952252.

The previous prime is 641952197. The next prime is 641952299. The reversal of 641952253 is 352259146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 340513209 + 301439044 = 18453^2 + 17362^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641952253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648952253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320976126 + 320976127.

It is an arithmetic number, because the mean of its divisors is an integer number (320976127).

Almost surely, 2^641952253 is an apocalyptic number.

It is an amenable number.

641952253 is a deficient number, since it is larger than the sum of its proper divisors (1).

641952253 is an equidigital number, since it uses as much as digits as its factorization.

641952253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 37.

The square root of 641952253 is about 25336.7766892318. The cubic root of 641952253 is about 862.6492368802.

The spelling of 641952253 in words is "six hundred forty-one million, nine hundred fifty-two thousand, two hundred fifty-three".