1321040145 has 16 divisors (see below), whose sum is σ = 2116068480. Its totient is φ = 703753344.

The previous prime is 1321040137. The next prime is 1321040179. The reversal of 1321040145 is 5410401231.

It is not a de Polignac number, because 1321040145 - 2³ = 1321040137 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36340 + ... + 62949.

It is an arithmetic number, because the mean of its divisors is an integer number (132254280).

Almost surely, 2^1321040145 is an apocalyptic number.

1321040145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321040145 is a deficient number, since it is larger than the sum of its proper divisors (795028335).

1321040145 is an equidigital number, since it uses as much as digits as its factorization.

1321040145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100184.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1321040145 is about 36346.1159548032. The cubic root of 1321040145 is about 1097.2493658540.

Adding to 1321040145 its reverse (5410401231), we get a palindrome (6731441376).

The spelling of 1321040145 in words is "one billion, three hundred twenty-one million, forty thousand, one hundred forty-five".