641070257 has 2 divisors, whose sum is σ = 641070258. Its totient is φ = 641070256.

The previous prime is 641070217. The next prime is 641070307. The reversal of 641070257 is 752070146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 641051761 + 18496 = 25319^2 + 136^2 .

It is a cyclic number.

It is not a de Polignac number, because 641070257 - 2⁶ = 641070193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (641070217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320535128 + 320535129.

It is an arithmetic number, because the mean of its divisors is an integer number (320535129).

Almost surely, 2^641070257 is an apocalyptic number.

It is an amenable number.

641070257 is a deficient number, since it is larger than the sum of its proper divisors (1).

641070257 is an equidigital number, since it uses as much as digits as its factorization.

641070257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 641070257 is about 25319.3652566568. The cubic root of 641070257 is about 862.2539832398.

It can be divided in two parts, 6410 and 70257, that added together give a palindrome (76667).

The spelling of 641070257 in words is "six hundred forty-one million, seventy thousand, two hundred fifty-seven".