641117731 has 4 divisors (see below), whose sum is σ = 641705392. Its totient is φ = 640530072.

The previous prime is 641117713. The next prime is 641117767. The reversal of 641117731 is 137711146.

641117731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137711146 = 2 ⋅68855573.

It is a cyclic number.

It is not a de Polignac number, because 641117731 - 2⁵ = 641117699 is a prime.

It is a super-2 number, since 2×641117731² = 822063890005176722, 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 = 641117693 and 641117702.

It is not an unprimeable number, because it can be changed into a prime (641117791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292191 + ... + 294376.

It is an arithmetic number, because the mean of its divisors is an integer number (160426348).

Almost surely, 2^641117731 is an apocalyptic number.

641117731 is a deficient number, since it is larger than the sum of its proper divisors (587661).

641117731 is a wasteful number, since it uses less digits than its factorization.

641117731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587660.

The product of its digits is 3528, while the sum is 31.

The square root of 641117731 is about 25320.3027430558. The cubic root of 641117731 is about 862.2752672487.

Adding to 641117731 its reverse (137711146), we get a palindrome (778828877).

It can be divided in two parts, 6411 and 17731, that added together give a palindrome (24142).

The spelling of 641117731 in words is "six hundred forty-one million, one hundred seventeen thousand, seven hundred thirty-one".