20120502109 has 2 divisors, whose sum is σ = 20120502110. Its totient is φ = 20120502108.

The previous prime is 20120502107. The next prime is 20120502119. The reversal of 20120502109 is 90120502102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19874796484 + 245705625 = 140978^2 + 15675^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120502109 - 2¹ = 20120502107 is a prime.

Together with 20120502107, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20120502109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120502107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060251054 + 10060251055.

It is an arithmetic number, because the mean of its divisors is an integer number (10060251055).

Almost surely, 2^20120502109 is an apocalyptic number.

It is an amenable number.

20120502109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120502109 is an equidigital number, since it uses as much as digits as its factorization.

20120502109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

The spelling of 20120502109 in words is "twenty billion, one hundred twenty million, five hundred two thousand, one hundred nine".