161262109 has 2 divisors, whose sum is σ = 161262110. Its totient is φ = 161262108.

The previous prime is 161262107. The next prime is 161262191. The reversal of 161262109 is 901262161.

161262109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140304025 + 20958084 = 11845^2 + 4578^2 .

It is a cyclic number.

It is not a de Polignac number, because 161262109 - 2¹ = 161262107 is a prime.

Together with 161262107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161262107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80631054 + 80631055.

It is an arithmetic number, because the mean of its divisors is an integer number (80631055).

Almost surely, 2^161262109 is an apocalyptic number.

It is an amenable number.

161262109 is a deficient number, since it is larger than the sum of its proper divisors (1).

161262109 is an equidigital number, since it uses as much as digits as its factorization.

161262109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 161262109 is about 12698.9018816589. The cubic root of 161262109 is about 544.3072408845.

The spelling of 161262109 in words is "one hundred sixty-one million, two hundred sixty-two thousand, one hundred nine".