620515109 has 2 divisors, whose sum is σ = 620515110. Its totient is φ = 620515108.

The previous prime is 620515081. The next prime is 620515141. The reversal of 620515109 is 901515026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 618914884 + 1600225 = 24878^2 + 1265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620515109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620515199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310257554 + 310257555.

It is an arithmetic number, because the mean of its divisors is an integer number (310257555).

Almost surely, 2^620515109 is an apocalyptic number.

It is an amenable number.

620515109 is a deficient number, since it is larger than the sum of its proper divisors (1).

620515109 is an equidigital number, since it uses as much as digits as its factorization.

620515109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 620515109 is about 24910.1406860740. The cubic root of 620515109 is about 852.9379804983.

The spelling of 620515109 in words is "six hundred twenty million, five hundred fifteen thousand, one hundred nine".