641163631 has 4 divisors (see below), whose sum is σ = 653261112. Its totient is φ = 629066152.

The previous prime is 641163623. The next prime is 641163641. The reversal of 641163631 is 136361146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136361146 = 2 ⋅68180573.

It is a cyclic number.

It is not a de Polignac number, because 641163631 - 2³ = 641163623 is a prime.

It is a super-2 number, since 2×641163631² = 822181603434208322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641163593 and 641163602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641163641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6048661 + ... + 6048766.

It is an arithmetic number, because the mean of its divisors is an integer number (163315278).

Almost surely, 2^641163631 is an apocalyptic number.

641163631 is a deficient number, since it is larger than the sum of its proper divisors (12097481).

641163631 is a wasteful number, since it uses less digits than its factorization.

641163631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12097480.

The product of its digits is 7776, while the sum is 31.

The square root of 641163631 is about 25321.2091141004. The cubic root of 641163631 is about 862.2958445875.

The spelling of 641163631 in words is "six hundred forty-one million, one hundred sixty-three thousand, six hundred thirty-one".