641156 has 12 divisors (see below), whose sum is σ = 1135260. Its totient is φ = 316800.

The previous prime is 641143. The next prime is 641167. The reversal of 641156 is 651146.

It can be written as a sum of positive squares in 2 ways, for example, as 102400 + 538756 = 320^2 + 734^2 .

It is a super-2 number, since 2×641156² = 822162032672, which contains 22 as substring.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 641156.

It is an unprimeable number.

641156 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545 + ... + 1256.

It is an arithmetic number, because the mean of its divisors is an integer number (94605).

2⁶⁴¹¹⁵⁶ is an apocalyptic number.

It is an amenable number.

641156 is a deficient number, since it is larger than the sum of its proper divisors (494104).

641156 is a wasteful number, since it uses less digits than its factorization.

641156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894 (or 1892 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 641156 is about 800.7221740404. The cubic root of 641156 is about 86.2292423617.

It can be divided in two parts, 641 and 156, that added together give a palindrome (797).

The spelling of 641156 in words is "six hundred forty-one thousand, one hundred fifty-six".