721171493 has 16 divisors (see below), whose sum is σ = 833906304. Its totient is φ = 610908480.

The previous prime is 721171483. The next prime is 721171523. The reversal of 721171493 is 394171127.

721171493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 721171493 - 2¹⁰ = 721170469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721171483) 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, 214838 + ... + 218168.

It is an arithmetic number, because the mean of its divisors is an integer number (52119144).

Almost surely, 2^721171493 is an apocalyptic number.

It is an amenable number.

721171493 is a deficient number, since it is larger than the sum of its proper divisors (112734811).

721171493 is a wasteful number, since it uses less digits than its factorization.

721171493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3692.

The product of its digits is 10584, while the sum is 35.

The square root of 721171493 is about 26854.6363408630. The cubic root of 721171493 is about 896.7667909335.

The spelling of 721171493 in words is "seven hundred twenty-one million, one hundred seventy-one thousand, four hundred ninety-three".