921385013 has 4 divisors (see below), whose sum is σ = 953156940. Its totient is φ = 889613088.

The previous prime is 921385009. The next prime is 921385033. The reversal of 921385013 is 310583129.

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 599613169 + 321771844 = 24487^2 + 17938^2 .

It is a cyclic number.

It is not a de Polignac number, because 921385013 - 2² = 921385009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921385033) 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, 15885920 + ... + 15885977.

It is an arithmetic number, because the mean of its divisors is an integer number (238289235).

Almost surely, 2^921385013 is an apocalyptic number.

It is an amenable number.

921385013 is a deficient number, since it is larger than the sum of its proper divisors (31771927).

921385013 is a wasteful number, since it uses less digits than its factorization.

921385013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31771926.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 921385013 is about 30354.3244530330. The cubic root of 921385013 is about 973.0766424370.

The spelling of 921385013 in words is "nine hundred twenty-one million, three hundred eighty-five thousand, thirteen".