721493629 has 4 divisors (see below), whose sum is σ = 722589120. Its totient is φ = 720398140.

The previous prime is 721493627. The next prime is 721493653. The reversal of 721493629 is 926394127.

721493629 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 926394127 = 2269 ⋅408283.

It is a cyclic number.

It is not a de Polignac number, because 721493629 - 2¹ = 721493627 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 (721493623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546757 + ... + 548074.

It is an arithmetic number, because the mean of its divisors is an integer number (180647280).

Almost surely, 2^721493629 is an apocalyptic number.

It is an amenable number.

721493629 is a deficient number, since it is larger than the sum of its proper divisors (1095491).

721493629 is a wasteful number, since it uses less digits than its factorization.

721493629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095490.

The product of its digits is 163296, while the sum is 43.

The square root of 721493629 is about 26860.6334437593. The cubic root of 721493629 is about 896.9002949464.

The spelling of 721493629 in words is "seven hundred twenty-one million, four hundred ninety-three thousand, six hundred twenty-nine".