601221639 has 4 divisors (see below), whose sum is σ = 801628856. Its totient is φ = 400814424.

The previous prime is 601221563. The next prime is 601221641. The reversal of 601221639 is 936122106.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 601221639 - 2¹⁵ = 601188871 is a prime.

It is a super-2 number, since 2×601221639² = 722934918403692642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (601221659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100203604 + ... + 100203609.

It is an arithmetic number, because the mean of its divisors is an integer number (200407214).

Almost surely, 2^601221639 is an apocalyptic number.

601221639 is a deficient number, since it is larger than the sum of its proper divisors (200407217).

601221639 is a wasteful number, since it uses less digits than its factorization.

601221639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200407216.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 601221639 is about 24519.8213492676. The cubic root of 601221639 is about 844.0047051504.

The spelling of 601221639 in words is "six hundred one million, two hundred twenty-one thousand, six hundred thirty-nine".