621115623 has 6 divisors (see below), whose sum is σ = 897167024. Its totient is φ = 414077076.

The previous prime is 621115577. The next prime is 621115637. The reversal of 621115623 is 326511126.

621115623 is a `hidden beast` number, since 6 + 21 + 1 + 15 + 623 = 666.

621115623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 621115623 - 2¹⁴ = 621099239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621115673) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34506415 + ... + 34506432.

Almost surely, 2^621115623 is an apocalyptic number.

621115623 is a deficient number, since it is larger than the sum of its proper divisors (276051401).

621115623 is a wasteful number, since it uses less digits than its factorization.

621115623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69012853 (or 69012850 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 621115623 is about 24922.1913763618. The cubic root of 621115623 is about 853.2130401755.

Adding to 621115623 its reverse (326511126), we get a palindrome (947626749).

The spelling of 621115623 in words is "six hundred twenty-one million, one hundred fifteen thousand, six hundred twenty-three".