621161117 has 2 divisors, whose sum is σ = 621161118. Its totient is φ = 621161116.

The previous prime is 621161083. The next prime is 621161137. The reversal of 621161117 is 711161126.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 539818756 + 81342361 = 23234^2 + 9019^2 .

It is a cyclic number.

It is not a de Polignac number, because 621161117 - 2²² = 616966813 is a prime.

It is a super-2 number, since 2×621161117² = 771682266545375378, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621161137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310580558 + 310580559.

It is an arithmetic number, because the mean of its divisors is an integer number (310580559).

Almost surely, 2^621161117 is an apocalyptic number.

It is an amenable number.

621161117 is a deficient number, since it is larger than the sum of its proper divisors (1).

621161117 is an equidigital number, since it uses as much as digits as its factorization.

621161117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 26.

The square root of 621161117 is about 24923.1040803508. The cubic root of 621161117 is about 853.2338710402.

Subtracting 621161117 from its reverse (711161126), we obtain a palindrome (90000009).

The spelling of 621161117 in words is "six hundred twenty-one million, one hundred sixty-one thousand, one hundred seventeen".