1255163321 has 4 divisors (see below), whose sum is σ = 1289086692. Its totient is φ = 1221239952.

The previous prime is 1255163303. The next prime is 1255163339. The reversal of 1255163321 is 1233615521.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1255163303) and next prime (1255163339).

It can be written as a sum of positive squares in 2 ways, for example, as 569299600 + 685863721 = 23860^2 + 26189^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255163321 - 2²⁶ = 1188054457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255163621) 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, 16961630 + ... + 16961703.

It is an arithmetic number, because the mean of its divisors is an integer number (322271673).

Almost surely, 2^1255163321 is an apocalyptic number.

It is an amenable number.

1255163321 is a deficient number, since it is larger than the sum of its proper divisors (33923371).

1255163321 is an equidigital number, since it uses as much as digits as its factorization.

1255163321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33923370.

The product of its digits is 5400, while the sum is 29.

The square root of 1255163321 is about 35428.2841949762. The cubic root of 1255163321 is about 1078.6985125363.

Adding to 1255163321 its reverse (1233615521), we get a palindrome (2488778842).

The spelling of 1255163321 in words is "one billion, two hundred fifty-five million, one hundred sixty-three thousand, three hundred twenty-one".