641540095631 has 2 divisors, whose sum is σ = 641540095632. Its totient is φ = 641540095630.

The previous prime is 641540095621. The next prime is 641540095661. The reversal of 641540095631 is 136590045146.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641540095631 is a prime.

It is a super-2 number, since 2×641540095631² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641540095621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320770047815 + 320770047816.

It is an arithmetic number, because the mean of its divisors is an integer number (320770047816).

Almost surely, 2^641540095631 is an apocalyptic number.

641540095631 is a deficient number, since it is larger than the sum of its proper divisors (1).

641540095631 is an equidigital number, since it uses as much as digits as its factorization.

641540095631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 641540095631 in words is "six hundred forty-one billion, five hundred forty million, ninety-five thousand, six hundred thirty-one".