71212673309 has 2 divisors, whose sum is σ = 71212673310. Its totient is φ = 71212673308.

The previous prime is 71212673299. The next prime is 71212673353. The reversal of 71212673309 is 90337621217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40563168409 + 30649504900 = 201403^2 + 175070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71212673309 is a prime.

It is a super-2 number, since 2×71212673309² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71212673509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35606336654 + 35606336655.

It is an arithmetic number, because the mean of its divisors is an integer number (35606336655).

Almost surely, 2^71212673309 is an apocalyptic number.

It is an amenable number.

71212673309 is a deficient number, since it is larger than the sum of its proper divisors (1).

71212673309 is an equidigital number, since it uses as much as digits as its factorization.

71212673309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 41.

The spelling of 71212673309 in words is "seventy-one billion, two hundred twelve million, six hundred seventy-three thousand, three hundred nine".