641511267 has 4 divisors (see below), whose sum is σ = 855348360. Its totient is φ = 427674176.

The previous prime is 641511251. The next prime is 641511287. The reversal of 641511267 is 762115146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 641511267 - 2⁴ = 641511251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641511287) 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, 106918542 + ... + 106918547.

It is an arithmetic number, because the mean of its divisors is an integer number (213837090).

Almost surely, 2^641511267 is an apocalyptic number.

641511267 is a deficient number, since it is larger than the sum of its proper divisors (213837093).

641511267 is a wasteful number, since it uses less digits than its factorization.

641511267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213837092.

The product of its digits is 10080, while the sum is 33.

The square root of 641511267 is about 25328.0727059917. The cubic root of 641511267 is about 862.4516607229.

The spelling of 641511267 in words is "six hundred forty-one million, five hundred eleven thousand, two hundred sixty-seven".