641403829931 has 4 divisors (see below), whose sum is σ = 641514023664. Its totient is φ = 641293636200.

The previous prime is 641403829877. The next prime is 641403829949. The reversal of 641403829931 is 139928304146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641403829931 is a prime.

It is a super-2 number, since 2×641403829931² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641403829931.

It is not an unprimeable number, because it can be changed into a prime (641403829951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55088135 + ... + 55099776.

It is an arithmetic number, because the mean of its divisors is an integer number (160378505916).

Almost surely, 2^641403829931 is an apocalyptic number.

641403829931 is a deficient number, since it is larger than the sum of its proper divisors (110193733).

641403829931 is a wasteful number, since it uses less digits than its factorization.

641403829931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110193732.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The spelling of 641403829931 in words is "six hundred forty-one billion, four hundred three million, eight hundred twenty-nine thousand, nine hundred thirty-one".