620813971 has 2 divisors, whose sum is σ = 620813972. Its totient is φ = 620813970.

The previous prime is 620813959. The next prime is 620813981. The reversal of 620813971 is 179318026.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 620813971 - 2²⁵ = 587259539 is a prime.

It is a super-3 number, since 3×620813971³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 620813971.

It is not a weakly prime, because it can be changed into another prime (620813951) 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, 310406985 + 310406986.

It is an arithmetic number, because the mean of its divisors is an integer number (310406986).

Almost surely, 2^620813971 is an apocalyptic number.

620813971 is a deficient number, since it is larger than the sum of its proper divisors (1).

620813971 is an equidigital number, since it uses as much as digits as its factorization.

620813971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 620813971 is about 24916.1387658682. The cubic root of 620813971 is about 853.0748935422.

The spelling of 620813971 in words is "six hundred twenty million, eight hundred thirteen thousand, nine hundred seventy-one".