85280810727121 has 3 divisors (see below), whose sum is σ = 85280819961883. Its totient is φ = 85280801492360.

The previous prime is 85280810727097. The next prime is 85280810727131. The reversal of 85280810727121 is 12172701808258.

The square root of 85280810727121 is 9234761.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 41541105767121 + 43739704960000 = 6445239^2 + 6613600^2 .

It is not a de Polignac number, because 85280810727121 - 2⁵ = 85280810727089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85280810727131) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4617381 + ... + 13852141.

Almost surely, 2^{85280810727121} is an apocalyptic number.

85280810727121 is the 9234761-st square number.

85280810727121 is the 4617381-st centered octagonal number.

It is an amenable number.

85280810727121 is a deficient number, since it is larger than the sum of its proper divisors (9234762).

85280810727121 is an frugal number, since it uses more digits than its factorization.

85280810727121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18469522 (or 9234761 counting only the distinct ones).

The product of its (nonzero) digits is 1003520, while the sum is 52.

The spelling of 85280810727121 in words is "eighty-five trillion, two hundred eighty billion, eight hundred ten million, seven hundred twenty-seven thousand, one hundred twenty-one".