620854309 has 2 divisors, whose sum is σ = 620854310. Its totient is φ = 620854308.

The previous prime is 620854261. The next prime is 620854337. The reversal of 620854309 is 903458026.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 340291809 + 280562500 = 18447^2 + 16750^2 .

It is a cyclic number.

It is not a de Polignac number, because 620854309 - 2¹³ = 620846117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620854379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310427154 + 310427155.

It is an arithmetic number, because the mean of its divisors is an integer number (310427155).

Almost surely, 2^620854309 is an apocalyptic number.

It is an amenable number.

620854309 is a deficient number, since it is larger than the sum of its proper divisors (1).

620854309 is an equidigital number, since it uses as much as digits as its factorization.

620854309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 620854309 is about 24916.9482280636. The cubic root of 620854309 is about 853.0933696029.

The spelling of 620854309 in words is "six hundred twenty million, eight hundred fifty-four thousand, three hundred nine".