641540426 has 8 divisors (see below), whose sum is σ = 1004150304. Its totient is φ = 306823660.

The previous prime is 641540413. The next prime is 641540531. The reversal of 641540426 is 624045146.

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

It is a super-3 number, since 3×641540426³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 641540392 and 641540401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6973220 + ... + 6973311.

It is an arithmetic number, because the mean of its divisors is an integer number (125518788).

Almost surely, 2^641540426 is an apocalyptic number.

641540426 is a deficient number, since it is larger than the sum of its proper divisors (362609878).

641540426 is a wasteful number, since it uses less digits than its factorization.

641540426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13946556.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 641540426 is about 25328.6483255621. The cubic root of 641540426 is about 862.4647277041.

The spelling of 641540426 in words is "six hundred forty-one million, five hundred forty thousand, four hundred twenty-six".