620915761 has 2 divisors, whose sum is σ = 620915762. Its totient is φ = 620915760.

The previous prime is 620915719. The next prime is 620915777. The reversal of 620915761 is 167519026.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 564965361 + 55950400 = 23769^2 + 7480^2 .

It is a cyclic number.

It is not a de Polignac number, because 620915761 - 2⁹ = 620915249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 620915761.

It is not a weakly prime, because it can be changed into another prime (620916761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310457880 + 310457881.

It is an arithmetic number, because the mean of its divisors is an integer number (310457881).

Almost surely, 2^620915761 is an apocalyptic number.

It is an amenable number.

620915761 is a deficient number, since it is larger than the sum of its proper divisors (1).

620915761 is an equidigital number, since it uses as much as digits as its factorization.

620915761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 620915761 is about 24918.1813341183. The cubic root of 620915761 is about 853.1215149951.

The spelling of 620915761 in words is "six hundred twenty million, nine hundred fifteen thousand, seven hundred sixty-one".