770561221 has 4 divisors (see below), whose sum is σ = 777630700. Its totient is φ = 763491744.

The previous prime is 770561201. The next prime is 770561243. The reversal of 770561221 is 122165077.

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 642622500 + 127938721 = 25350^2 + 11311^2 .

It is a cyclic number.

It is not a de Polignac number, because 770561221 - 2⁵ = 770561189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (770561201) 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, 3534576 + ... + 3534793.

It is an arithmetic number, because the mean of its divisors is an integer number (194407675).

Almost surely, 2^770561221 is an apocalyptic number.

It is an amenable number.

770561221 is a deficient number, since it is larger than the sum of its proper divisors (7069479).

770561221 is a wasteful number, since it uses less digits than its factorization.

770561221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7069478.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 770561221 is about 27758.9845095241. The cubic root of 770561221 is about 916.7882735563.

The spelling of 770561221 in words is "seven hundred seventy million, five hundred sixty-one thousand, two hundred twenty-one".