770551321 has 4 divisors (see below), whose sum is σ = 778180644. Its totient is φ = 762922000.

The previous prime is 770551319. The next prime is 770551349. The reversal of 770551321 is 123155077.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123155077 = 4549 ⋅27073.

It can be written as a sum of positive squares in 2 ways, for example, as 727057296 + 43494025 = 26964^2 + 6595^2 .

It is a cyclic number.

It is not a de Polignac number, because 770551321 - 2¹ = 770551319 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (770551351) 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, 3814510 + ... + 3814711.

It is an arithmetic number, because the mean of its divisors is an integer number (194545161).

Almost surely, 2^770551321 is an apocalyptic number.

It is an amenable number.

770551321 is a deficient number, since it is larger than the sum of its proper divisors (7629323).

770551321 is a wasteful number, since it uses less digits than its factorization.

770551321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7629322.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 770551321 is about 27758.8061883072. The cubic root of 770551321 is about 916.7843473085.

The spelling of 770551321 in words is "seven hundred seventy million, five hundred fifty-one thousand, three hundred twenty-one".