724121013 has 16 divisors (see below), whose sum is σ = 1203734016. Its totient is φ = 376166640.

The previous prime is 724121009. The next prime is 724121017. The reversal of 724121013 is 310121427.

It is an interprime number because it is at equal distance from previous prime (724121009) and next prime (724121017).

It is not a de Polignac number, because 724121013 - 2² = 724121009 is a prime.

It is a super-3 number, since 3×724121013³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724121017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1567131 + ... + 1567592.

It is an arithmetic number, because the mean of its divisors is an integer number (75233376).

Almost surely, 2^724121013 is an apocalyptic number.

It is an amenable number.

724121013 is a deficient number, since it is larger than the sum of its proper divisors (479613003).

724121013 is a wasteful number, since it uses less digits than its factorization.

724121013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3134744.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 724121013 is about 26909.4967065532. The cubic root of 724121013 is about 897.9876904512.

The spelling of 724121013 in words is "seven hundred twenty-four million, one hundred twenty-one thousand, thirteen".