1321443245 has 8 divisors (see below), whose sum is σ = 1591376760. Its totient is φ = 1053391360.

The previous prime is 1321443209. The next prime is 1321443251. The reversal of 1321443245 is 5423441231.

It can be written as a sum of positive squares in 4 ways, for example, as 436559236 + 884884009 = 20894^2 + 29747^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1321443245 - 2²² = 1317248941 is a prime.

It is a super-2 number, since 2×1321443245² = 3492424499512260050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 468860 + ... + 471669.

It is an arithmetic number, because the mean of its divisors is an integer number (198922095).

Almost surely, 2^1321443245 is an apocalyptic number.

It is an amenable number.

1321443245 is a deficient number, since it is larger than the sum of its proper divisors (269933515).

1321443245 is an equidigital number, since it uses as much as digits as its factorization.

1321443245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940815.

The product of its digits is 11520, while the sum is 29.

The square root of 1321443245 is about 36351.6608286334. The cubic root of 1321443245 is about 1097.3609587886.

Adding to 1321443245 its reverse (5423441231), we get a palindrome (6744884476).

The spelling of 1321443245 in words is "one billion, three hundred twenty-one million, four hundred forty-three thousand, two hundred forty-five".