71131077217 has 4 divisors (see below), whose sum is σ = 71132119060. Its totient is φ = 71130035376.

The previous prime is 71131077211. The next prime is 71131077229. The reversal of 71131077217 is 71277013117.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52207223121 + 18923854096 = 228489^2 + 137564^2 .

It is a cyclic number.

It is not a de Polignac number, because 71131077217 - 2¹⁵ = 71131044449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71131077211) 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, 410742 + ... + 557647.

It is an arithmetic number, because the mean of its divisors is an integer number (17783029765).

Almost surely, 2^71131077217 is an apocalyptic number.

It is an amenable number.

71131077217 is a deficient number, since it is larger than the sum of its proper divisors (1041843).

71131077217 is an equidigital number, since it uses as much as digits as its factorization.

71131077217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041842.

The product of its (nonzero) digits is 14406, while the sum is 37.

The spelling of 71131077217 in words is "seventy-one billion, one hundred thirty-one million, seventy-seven thousand, two hundred seventeen".