641021031 has 24 divisors (see below), whose sum is σ = 1113889920. Its totient is φ = 347018256.

The previous prime is 641021027. The next prime is 641021033. The reversal of 641021031 is 130120146.

It is a happy number.

641021031 is a `hidden beast` number, since 641 + 0 + 21 + 0 + 3 + 1 = 666.

641021031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 641021031 - 2² = 641021027 is a prime.

It is a super-2 number, since 2×641021031² = 821815924368605922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641020995 and 641021013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641021033) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 266565 + ... + 268958.

It is an arithmetic number, because the mean of its divisors is an integer number (46412080).

Almost surely, 2^641021031 is an apocalyptic number.

641021031 is a deficient number, since it is larger than the sum of its proper divisors (472868889).

641021031 is a wasteful number, since it uses less digits than its factorization.

641021031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535555 (or 535552 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 641021031 is about 25318.3931362162. The cubic root of 641021031 is about 862.2319126474.

Adding to 641021031 its reverse (130120146), we get a palindrome (771141177).

The spelling of 641021031 in words is "six hundred forty-one million, twenty-one thousand, thirty-one".