71810920231 has 4 divisors (see below), whose sum is σ = 71815576752. Its totient is φ = 71806263712.

The previous prime is 71810920217. The next prime is 71810920249. The reversal of 71810920231 is 13202901817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13202901817 = 7 ⋅1886128831.

It is a cyclic number.

It is not a de Polignac number, because 71810920231 - 2⁵ = 71810920199 is a prime.

It is a super-2 number, since 2×71810920231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71810930231) 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, 2305051 + ... + 2335996.

It is an arithmetic number, because the mean of its divisors is an integer number (17953894188).

Almost surely, 2^71810920231 is an apocalyptic number.

71810920231 is a deficient number, since it is larger than the sum of its proper divisors (4656521).

71810920231 is a wasteful number, since it uses less digits than its factorization.

71810920231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4656520.

The product of its (nonzero) digits is 6048, while the sum is 34.

The spelling of 71810920231 in words is "seventy-one billion, eight hundred ten million, nine hundred twenty thousand, two hundred thirty-one".