620611021 has 8 divisors (see below), whose sum is σ = 628702560. Its totient is φ = 612562128.

The previous prime is 620610971. The next prime is 620611051. The reversal of 620611021 is 120116026.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620611021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 620611021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620611051) 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, 19170 + ... + 40108.

It is an arithmetic number, because the mean of its divisors is an integer number (78587820).

Almost surely, 2^620611021 is an apocalyptic number.

It is an amenable number.

620611021 is a deficient number, since it is larger than the sum of its proper divisors (8091539).

620611021 is a wasteful number, since it uses less digits than its factorization.

620611021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21323.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 620611021 is about 24912.0657714289. The cubic root of 620611021 is about 852.9819239747.

Adding to 620611021 its reverse (120116026), we get a palindrome (740727047).

The spelling of 620611021 in words is "six hundred twenty million, six hundred eleven thousand, twenty-one".