641542723 has 8 divisors (see below), whose sum is σ = 653295456. Its totient is φ = 629865600.

The previous prime is 641542711. The next prime is 641542739. The reversal of 641542723 is 327245146.

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 641542723 - 2¹⁷ = 641411651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641522723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1636 + ... + 35857.

It is an arithmetic number, because the mean of its divisors is an integer number (81661932).

Almost surely, 2^641542723 is an apocalyptic number.

641542723 is a deficient number, since it is larger than the sum of its proper divisors (11752733).

641542723 is a wasteful number, since it uses less digits than its factorization.

641542723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37805.

The product of its digits is 40320, while the sum is 34.

The square root of 641542723 is about 25328.6936694335. The cubic root of 641542723 is about 862.4657570386.

Adding to 641542723 its reverse (327245146), we get a palindrome (968787869).

The spelling of 641542723 in words is "six hundred forty-one million, five hundred forty-two thousand, seven hundred twenty-three".