71991000269 has 2 divisors, whose sum is σ = 71991000270. Its totient is φ = 71991000268.

The previous prime is 71991000253. The next prime is 71991000299. The reversal of 71991000269 is 96200019917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71951624644 + 39375625 = 268238^2 + 6275^2 .

It is a cyclic number.

It is not a de Polignac number, because 71991000269 - 2⁴ = 71991000253 is a prime.

It is a super-2 number, since 2×71991000269² (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 (71991000299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35995500134 + 35995500135.

It is an arithmetic number, because the mean of its divisors is an integer number (35995500135).

Almost surely, 2^71991000269 is an apocalyptic number.

It is an amenable number.

71991000269 is a deficient number, since it is larger than the sum of its proper divisors (1).

71991000269 is an equidigital number, since it uses as much as digits as its factorization.

71991000269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 44.

The spelling of 71991000269 in words is "seventy-one billion, nine hundred ninety-one million, two hundred sixty-nine", and thus it is an aban number.