73121013 has 24 divisors (see below), whose sum is σ = 121263168. Its totient is φ = 41591232.

The previous prime is 73120967. The next prime is 73121017. The reversal of 73121013 is 31012137.

It is not a de Polignac number, because 73121013 - 2¹³ = 73112821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73121017) 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 23 ways as a sum of consecutive naturals, for example, 11745 + ... + 16857.

It is an arithmetic number, because the mean of its divisors is an integer number (5052632).

Almost surely, 2^73121013 is an apocalyptic number.

It is an amenable number.

73121013 is a deficient number, since it is larger than the sum of its proper divisors (48142155).

73121013 is a wasteful number, since it uses less digits than its factorization.

73121013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5353 (or 5350 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 73121013 is about 8551.0825630443. The cubic root of 73121013 is about 418.1647302163.

The spelling of 73121013 in words is "seventy-three million, one hundred twenty-one thousand, thirteen".