620021117 has 2 divisors, whose sum is σ = 620021118. Its totient is φ = 620021116.

The previous prime is 620021113. The next prime is 620021119. The reversal of 620021117 is 711120026.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 348232921 + 271788196 = 18661^2 + 16486^2 .

It is a cyclic number.

It is not a de Polignac number, because 620021117 - 2² = 620021113 is a prime.

Together with 620021119, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620021113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310010558 + 310010559.

It is an arithmetic number, because the mean of its divisors is an integer number (310010559).

Almost surely, 2^620021117 is an apocalyptic number.

It is an amenable number.

620021117 is a deficient number, since it is larger than the sum of its proper divisors (1).

620021117 is an equidigital number, since it uses as much as digits as its factorization.

620021117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 620021117 is about 24900.2232319311. The cubic root of 620021117 is about 852.7115791354.

The spelling of 620021117 in words is "six hundred twenty million, twenty-one thousand, one hundred seventeen".