641613623 has 8 divisors (see below), whose sum is σ = 740126592. Its totient is φ = 544814136.

The previous prime is 641613619. The next prime is 641613629. The reversal of 641613623 is 326316146.

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 641613623 - 2² = 641613619 is a prime.

It is a super-2 number, since 2×641613623² = 823336082438372258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641613623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641613629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427565 + ... + 429062.

It is an arithmetic number, because the mean of its divisors is an integer number (92515824).

Almost surely, 2^641613623 is an apocalyptic number.

641613623 is a deficient number, since it is larger than the sum of its proper divisors (98512969).

641613623 is a wasteful number, since it uses less digits than its factorization.

641613623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856741.

The product of its digits is 15552, while the sum is 32.

The square root of 641613623 is about 25330.0932292007. The cubic root of 641613623 is about 862.4975276272.

Adding to 641613623 its reverse (326316146), we get a palindrome (967929769).

The spelling of 641613623 in words is "six hundred forty-one million, six hundred thirteen thousand, six hundred twenty-three".