1321015345 has 16 divisors (see below), whose sum is σ = 1807580880. Its totient is φ = 918134784.

The previous prime is 1321015331. The next prime is 1321015351. The reversal of 1321015345 is 5435101231.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 65092624 + 1255922721 = 8068^2 + 35439^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321015345 - 2¹⁵ = 1320982577 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 596640 + ... + 598849.

It is an arithmetic number, because the mean of its divisors is an integer number (112973805).

Almost surely, 2^1321015345 is an apocalyptic number.

It is an amenable number.

1321015345 is a deficient number, since it is larger than the sum of its proper divisors (486565535).

1321015345 is a wasteful number, since it uses less digits than its factorization.

1321015345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195524.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1321015345 is about 36345.7747888252. The cubic root of 1321015345 is about 1097.2424995589.

Adding to 1321015345 its reverse (5435101231), we get a palindrome (6756116576).

The spelling of 1321015345 in words is "one billion, three hundred twenty-one million, fifteen thousand, three hundred forty-five".