641020231 has 2 divisors, whose sum is σ = 641020232. Its totient is φ = 641020230.

The previous prime is 641020229. The next prime is 641020243. The reversal of 641020231 is 132020146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641020231 - 2¹ = 641020229 is a prime.

It is a super-2 number, since 2×641020231² = 821813873102586722, which contains 22 as substring.

Together with 641020229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 641020199 and 641020208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641021231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320510115 + 320510116.

It is an arithmetic number, because the mean of its divisors is an integer number (320510116).

Almost surely, 2^641020231 is an apocalyptic number.

641020231 is a deficient number, since it is larger than the sum of its proper divisors (1).

641020231 is an equidigital number, since it uses as much as digits as its factorization.

641020231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 641020231 is about 25318.3773374203. The cubic root of 641020231 is about 862.2315539562.

Adding to 641020231 its reverse (132020146), we get a palindrome (773040377).

The spelling of 641020231 in words is "six hundred forty-one million, twenty thousand, two hundred thirty-one".