641220215 has 8 divisors (see below), whose sum is σ = 777083328. Its totient is φ = 507896800.

The previous prime is 641220199. The next prime is 641220233. The reversal of 641220215 is 512022146.

It is a happy number.

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

It is not a de Polignac number, because 641220215 - 2⁴ = 641220199 is a prime.

It is a super-2 number, since 2×641220215² = 822326728249292450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 634367 + ... + 635376.

It is an arithmetic number, because the mean of its divisors is an integer number (97135416).

Almost surely, 2^641220215 is an apocalyptic number.

641220215 is a deficient number, since it is larger than the sum of its proper divisors (135863113).

641220215 is a wasteful number, since it uses less digits than its factorization.

641220215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1269849.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 641220215 is about 25322.3264136611. The cubic root of 641220215 is about 862.3212102978.

The spelling of 641220215 in words is "six hundred forty-one million, two hundred twenty thousand, two hundred fifteen".