72061109 has 2 divisors, whose sum is σ = 72061110. Its totient is φ = 72061108.

The previous prime is 72061103. The next prime is 72061123. The reversal of 72061109 is 90116027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48344209 + 23716900 = 6953^2 + 4870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72061109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72061103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36030554 + 36030555.

It is an arithmetic number, because the mean of its divisors is an integer number (36030555).

Almost surely, 2^72061109 is an apocalyptic number.

It is an amenable number.

72061109 is a deficient number, since it is larger than the sum of its proper divisors (1).

72061109 is an equidigital number, since it uses as much as digits as its factorization.

72061109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 72061109 is about 8488.8814928705. The cubic root of 72061109 is about 416.1344274787.

The spelling of 72061109 in words is "seventy-two million, sixty-one thousand, one hundred nine".