1321913513 has 8 divisors (see below), whose sum is σ = 1355429376. Its totient is φ = 1288458400.

The previous prime is 1321913473. The next prime is 1321913531. The reversal of 1321913513 is 3153191231.

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

It is a cyclic number.

It is not a de Polignac number, because 1321913513 - 2¹⁰ = 1321912489 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 (1321913573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30608 + ... + 59838.

It is an arithmetic number, because the mean of its divisors is an integer number (169428672).

Almost surely, 2^1321913513 is an apocalyptic number.

It is an amenable number.

1321913513 is a deficient number, since it is larger than the sum of its proper divisors (33515863).

1321913513 is a wasteful number, since it uses less digits than its factorization.

1321913513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30375.

The product of its digits is 2430, while the sum is 29.

The square root of 1321913513 is about 36358.1285684508. The cubic root of 1321913513 is about 1097.4911176233.

The spelling of 1321913513 in words is "one billion, three hundred twenty-one million, nine hundred thirteen thousand, five hundred thirteen".