621612445 has 4 divisors (see below), whose sum is σ = 745934940. Its totient is φ = 497289952.

The previous prime is 621612443. The next prime is 621612491. The reversal of 621612445 is 544216126.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 91738084 + 529874361 = 9578^2 + 23019^2 .

It is a cyclic number.

It is not a de Polignac number, because 621612445 - 2¹ = 621612443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621612443) 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, 62161240 + ... + 62161249.

It is an arithmetic number, because the mean of its divisors is an integer number (186483735).

Almost surely, 2^621612445 is an apocalyptic number.

It is an amenable number.

621612445 is a deficient number, since it is larger than the sum of its proper divisors (124322495).

621612445 is a wasteful number, since it uses less digits than its factorization.

621612445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124322494.

The product of its digits is 11520, while the sum is 31.

The square root of 621612445 is about 24932.1568461295. The cubic root of 621612445 is about 853.4404707434.

The spelling of 621612445 in words is "six hundred twenty-one million, six hundred twelve thousand, four hundred forty-five".