621216117 has 6 divisors (see below), whose sum is σ = 897312182. Its totient is φ = 414144072.

The previous prime is 621216109. The next prime is 621216121. The reversal of 621216117 is 711612126.

It is a happy number.

621216117 is a `hidden beast` number, since 6 + 21 + 21 + 611 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 315630756 + 305585361 = 17766^2 + 17481^2 .

It is not a de Polignac number, because 621216117 - 2³ = 621216109 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 (621216317) 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, 34511998 + ... + 34512015.

Almost surely, 2^621216117 is an apocalyptic number.

It is an amenable number.

621216117 is a deficient number, since it is larger than the sum of its proper divisors (276096065).

621216117 is a wasteful number, since it uses less digits than its factorization.

621216117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69024019 (or 69024016 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 621216117 is about 24924.2074497866. The cubic root of 621216117 is about 853.2590531691.

The spelling of 621216117 in words is "six hundred twenty-one million, two hundred sixteen thousand, one hundred seventeen".