71137109 has 2 divisors, whose sum is σ = 71137110. Its totient is φ = 71137108.

The previous prime is 71137103. The next prime is 71137123. The reversal of 71137109 is 90173117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70930084 + 207025 = 8422^2 + 455^2 .

It is a cyclic number.

It is not a de Polignac number, because 71137109 - 2⁸ = 71136853 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 (71137103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35568554 + 35568555.

It is an arithmetic number, because the mean of its divisors is an integer number (35568555).

Almost surely, 2^71137109 is an apocalyptic number.

It is an amenable number.

71137109 is a deficient number, since it is larger than the sum of its proper divisors (1).

71137109 is an equidigital number, since it uses as much as digits as its factorization.

71137109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1323, while the sum is 29.

The square root of 71137109 is about 8434.2817714373. The cubic root of 71137109 is about 414.3481497374.

The spelling of 71137109 in words is "seventy-one million, one hundred thirty-seven thousand, one hundred nine".