721001013 has 8 divisors (see below), whose sum is σ = 962068800. Its totient is φ = 480300288.

The previous prime is 721000993. The next prime is 721001023. The reversal of 721001013 is 310100127.

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

It is not a de Polignac number, because 721001013 - 2¹⁰ = 720999989 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 721000983 and 721001001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721001023) 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 7 ways as a sum of consecutive naturals, for example, 87148 + ... + 95061.

It is an arithmetic number, because the mean of its divisors is an integer number (120258600).

Almost surely, 2^721001013 is an apocalyptic number.

It is an amenable number.

721001013 is a deficient number, since it is larger than the sum of its proper divisors (241067787).

721001013 is a wasteful number, since it uses less digits than its factorization.

721001013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183531.

The product of its (nonzero) digits is 42, while the sum is 15.

The square root of 721001013 is about 26851.4620272342. The cubic root of 721001013 is about 896.6961221896.

The spelling of 721001013 in words is "seven hundred twenty-one million, one thousand, thirteen".