1321153115 has 8 divisors (see below), whose sum is σ = 1590796368. Its totient is φ = 1053314080.

The previous prime is 1321153091. The next prime is 1321153121. The reversal of 1321153115 is 5113511231.

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

It is not a de Polignac number, because 1321153115 - 2¹⁸ = 1320890971 is a prime.

It is a super-3 number, since 3×1321153115³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian 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, 449441 + ... + 452370.

It is an arithmetic number, because the mean of its divisors is an integer number (198849546).

Almost surely, 2^1321153115 is an apocalyptic number.

1321153115 is a deficient number, since it is larger than the sum of its proper divisors (269643253).

1321153115 is an equidigital number, since it uses as much as digits as its factorization.

1321153115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902109.

The product of its digits is 450, while the sum is 23.

The square root of 1321153115 is about 36347.6700078561. The cubic root of 1321153115 is about 1097.2806424023.

Adding to 1321153115 its reverse (5113511231), we get a palindrome (6434664346).

The spelling of 1321153115 in words is "one billion, three hundred twenty-one million, one hundred fifty-three thousand, one hundred fifteen".