1321570513 has 4 divisors (see below), whose sum is σ = 1367141940. Its totient is φ = 1275999088.

The previous prime is 1321570493. The next prime is 1321570519. The reversal of 1321570513 is 3150751231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 978876369 + 342694144 = 31287^2 + 18512^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321570513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321570519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22785670 + ... + 22785727.

It is an arithmetic number, because the mean of its divisors is an integer number (341785485).

Almost surely, 2^1321570513 is an apocalyptic number.

It is an amenable number.

1321570513 is a deficient number, since it is larger than the sum of its proper divisors (45571427).

1321570513 is an equidigital number, since it uses as much as digits as its factorization.

1321570513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45571426.

The product of its (nonzero) digits is 3150, while the sum is 28.

The square root of 1321570513 is about 36353.4112979786. The cubic root of 1321570513 is about 1097.3961865473.

The spelling of 1321570513 in words is "one billion, three hundred twenty-one million, five hundred seventy thousand, five hundred thirteen".