641444542 has 16 divisors (see below), whose sum is σ = 966514032. Its totient is φ = 319277440.

The previous prime is 641444537. The next prime is 641444593. The reversal of 641444542 is 245444146.

It is a super-2 number, since 2×641444542² = 822902200923179528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641444498 and 641444507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 660117 + ... + 661087.

It is an arithmetic number, because the mean of its divisors is an integer number (60407127).

Almost surely, 2^641444542 is an apocalyptic number.

641444542 is a deficient number, since it is larger than the sum of its proper divisors (325069490).

641444542 is a wasteful number, since it uses less digits than its factorization.

641444542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2123.

The product of its digits is 61440, while the sum is 34.

The square root of 641444542 is about 25326.7554574209. The cubic root of 641444542 is about 862.4217578538.

Adding to 641444542 its reverse (245444146), we get a palindrome (886888688).

It can be divided in two parts, 64144 and 4542, that added together give a palindrome (68686).

The spelling of 641444542 in words is "six hundred forty-one million, four hundred forty-four thousand, five hundred forty-two".