202906109 has 10 divisors (see below), whose sum is σ = 236712510. Its totient is φ = 173917464.

The previous prime is 202906103. The next prime is 202906147. The reversal of 202906109 is 901609202.

202906109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 185558884 + 17347225 = 13622^2 + 4165^2 .

It is a de Polignac number, because none of the positive numbers 2^k-202906109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202906103) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 39854 + ... + 44655.

It is an arithmetic number, because the mean of its divisors is an integer number (23671251).

Almost surely, 2^202906109 is an apocalyptic number.

It is an amenable number.

202906109 is a deficient number, since it is larger than the sum of its proper divisors (33806401).

202906109 is an frugal number, since it uses more digits than its factorization.

202906109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84537 (or 84516 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 202906109 is about 14244.5115395369. The cubic root of 202906109 is about 587.6224428061.

The spelling of 202906109 in words is "two hundred two million, nine hundred six thousand, one hundred nine".