641131 has 2 divisors, whose sum is σ = 641132. Its totient is φ = 641130.

The previous prime is 641129. The next prime is 641143. The reversal of 641131 is 131146.

641131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641131 - 2¹ = 641129 is a prime.

It is a super-2 number, since 2×641131² = 822097918322, which contains 22 as substring.

Together with 641129, it forms a pair of twin primes.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (641101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320565 + 320566.

It is an arithmetic number, because the mean of its divisors is an integer number (320566).

2⁶⁴¹¹³¹ is an apocalyptic number.

641131 is a deficient number, since it is larger than the sum of its proper divisors (1).

641131 is an equidigital number, since it uses as much as digits as its factorization.

641131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 16.

The square root of 641131 is about 800.7065629805. The cubic root of 641131 is about 86.2281215949.

Adding to 641131 its reverse (131146), we get a palindrome (772277).

The spelling of 641131 in words is "six hundred forty-one thousand, one hundred thirty-one".