621522243 has 24 divisors (see below), whose sum is σ = 946334480. Its totient is φ = 391988160.

The previous prime is 621522241. The next prime is 621522247. The reversal of 621522243 is 342225126.

It is a happy number.

It is not a de Polignac number, because 621522243 - 2¹ = 621522241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621522241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143733 + ... + 147993.

Almost surely, 2^621522243 is an apocalyptic number.

621522243 is a deficient number, since it is larger than the sum of its proper divisors (324812237).

621522243 is a wasteful number, since it uses less digits than its factorization.

621522243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5139 (or 5136 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 621522243 is about 24930.3478315085. The cubic root of 621522243 is about 853.3991879142.

Adding to 621522243 its reverse (342225126), we get a palindrome (963747369).

The spelling of 621522243 in words is "six hundred twenty-one million, five hundred twenty-two thousand, two hundred forty-three".