71208092309 has 4 divisors (see below), whose sum is σ = 72066021216. Its totient is φ = 70350163404.

The previous prime is 71208092281. The next prime is 71208092353. The reversal of 71208092309 is 90329080217.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90329080217 = 13339 ⋅6771803.

It is a cyclic number.

It is not a de Polignac number, because 71208092309 - 2¹² = 71208088213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71208092909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 428964329 + ... + 428964494.

It is an arithmetic number, because the mean of its divisors is an integer number (18016505304).

Almost surely, 2^71208092309 is an apocalyptic number.

It is an amenable number.

71208092309 is a deficient number, since it is larger than the sum of its proper divisors (857928907).

71208092309 is an equidigital number, since it uses as much as digits as its factorization.

71208092309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857928906.

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 71208092309 in words is "seventy-one billion, two hundred eight million, ninety-two thousand, three hundred nine".