771040081 has 16 divisors (see below), whose sum is σ = 912787200. Its totient is φ = 637253568.

The previous prime is 771040057. The next prime is 771040097. The reversal of 771040081 is 180040177.

It is not a de Polignac number, because 771040081 - 2⁹ = 771039569 is a prime.

It is a super-2 number, since 2×771040081² = 1189005613016973122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (771040001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184491 + ... + 188623.

It is an arithmetic number, because the mean of its divisors is an integer number (57049200).

Almost surely, 2^771040081 is an apocalyptic number.

It is an amenable number.

771040081 is a deficient number, since it is larger than the sum of its proper divisors (141747119).

771040081 is a wasteful number, since it uses less digits than its factorization.

771040081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5088.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 771040081 is about 27767.6084854278. The cubic root of 771040081 is about 916.9781448308.

The spelling of 771040081 in words is "seven hundred seventy-one million, forty thousand, eighty-one".