1220231329 has 2 divisors, whose sum is σ = 1220231330. Its totient is φ = 1220231328.

The previous prime is 1220231297. The next prime is 1220231359. The reversal of 1220231329 is 9231320221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 694217104 + 526014225 = 26348^2 + 22935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220231329 - 2⁵ = 1220231297 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220231359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610115664 + 610115665.

It is an arithmetic number, because the mean of its divisors is an integer number (610115665).

Almost surely, 2^1220231329 is an apocalyptic number.

It is an amenable number.

1220231329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220231329 is an equidigital number, since it uses as much as digits as its factorization.

1220231329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1220231329 is about 34931.8097011878. The cubic root of 1220231329 is about 1068.5972619228.

The spelling of 1220231329 in words is "one billion, two hundred twenty million, two hundred thirty-one thousand, three hundred twenty-nine".