1973213513 has 4 divisors (see below), whose sum is σ = 1973302548. Its totient is φ = 1973124480.

The previous prime is 1973213497. The next prime is 1973213527. The reversal of 1973213513 is 3153123791.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 559227904 + 1413985609 = 23648^2 + 37603^2 .

It is a cyclic number.

It is not a de Polignac number, because 1973213513 - 2⁴ = 1973213497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1973213533) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 17873 + ... + 65313.

It is an arithmetic number, because the mean of its divisors is an integer number (493325637).

Almost surely, 2^1973213513 is an apocalyptic number.

It is an amenable number.

1973213513 is a deficient number, since it is larger than the sum of its proper divisors (89035).

1973213513 is an equidigital number, since it uses as much as digits as its factorization.

1973213513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89034.

The product of its digits is 17010, while the sum is 35.

The square root of 1973213513 is about 44420.8679901688. The cubic root of 1973213513 is about 1254.2709400768.

The spelling of 1973213513 in words is "one billion, nine hundred seventy-three million, two hundred thirteen thousand, five hundred thirteen".