771268221 has 6 divisors (see below), whose sum is σ = 1114054110. Its totient is φ = 514178808.

The previous prime is 771268217. The next prime is 771268229. The reversal of 771268221 is 122862177.

It can be written as a sum of positive squares in only one way, i.e., 540562500 + 230705721 = 23250^2 + 15189^2 .

It is not a de Polignac number, because 771268221 - 2² = 771268217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (771268229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42848226 + ... + 42848243.

It is an arithmetic number, because the mean of its divisors is an integer number (185675685).

Almost surely, 2^771268221 is an apocalyptic number.

It is an amenable number.

771268221 is a deficient number, since it is larger than the sum of its proper divisors (342785889).

771268221 is a wasteful number, since it uses less digits than its factorization.

771268221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85696475 (or 85696472 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 771268221 is about 27771.7162055210. The cubic root of 771268221 is about 917.0685762578.

The spelling of 771268221 in words is "seven hundred seventy-one million, two hundred sixty-eight thousand, two hundred twenty-one".