770153221 has 4 divisors (see below), whose sum is σ = 770233932. Its totient is φ = 770072512.

The previous prime is 770153213. The next prime is 770153231. The reversal of 770153221 is 122351077.

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 2 ways, for example, as 491730625 + 278422596 = 22175^2 + 16686^2 .

It is a cyclic number.

It is not a de Polignac number, because 770153221 - 2³ = 770153213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 770153221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (770153231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23770 + ... + 45883.

It is an arithmetic number, because the mean of its divisors is an integer number (192558483).

Almost surely, 2^770153221 is an apocalyptic number.

It is an amenable number.

770153221 is a deficient number, since it is larger than the sum of its proper divisors (80711).

770153221 is a wasteful number, since it uses less digits than its factorization.

770153221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80710.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 770153221 is about 27751.6345644721. The cubic root of 770153221 is about 916.6264366844.

The spelling of 770153221 in words is "seven hundred seventy million, one hundred fifty-three thousand, two hundred twenty-one".