71962109 has 2 divisors, whose sum is σ = 71962110. Its totient is φ = 71962108.

The previous prime is 71962081. The next prime is 71962157. The reversal of 71962109 is 90126917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70392100 + 1570009 = 8390^2 + 1253^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71962109 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71962199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35981054 + 35981055.

It is an arithmetic number, because the mean of its divisors is an integer number (35981055).

Almost surely, 2^71962109 is an apocalyptic number.

It is an amenable number.

71962109 is a deficient number, since it is larger than the sum of its proper divisors (1).

71962109 is an equidigital number, since it uses as much as digits as its factorization.

71962109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 71962109 is about 8483.0483318203. The cubic root of 71962109 is about 415.9437736046.

The spelling of 71962109 in words is "seventy-one million, nine hundred sixty-two thousand, one hundred nine".