641156511 has 8 divisors (see below), whose sum is σ = 859817520. Its totient is φ = 424966592.

The previous prime is 641156489. The next prime is 641156521. The reversal of 641156511 is 115651146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641156511 - 2¹⁴ = 641140127 is a prime.

It is a super-2 number, since 2×641156511² = 822163343195386242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641156521) 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 7 ways as a sum of consecutive naturals, for example, 617166 + ... + 618203.

It is an arithmetic number, because the mean of its divisors is an integer number (107477190).

Almost surely, 2^641156511 is an apocalyptic number.

641156511 is a deficient number, since it is larger than the sum of its proper divisors (218661009).

641156511 is a wasteful number, since it uses less digits than its factorization.

641156511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235545.

The product of its digits is 3600, while the sum is 30.

The square root of 641156511 is about 25321.0685201079. The cubic root of 641156511 is about 862.2926526986.

The spelling of 641156511 in words is "six hundred forty-one million, one hundred fifty-six thousand, five hundred eleven".