721616413 has 16 divisors (see below), whose sum is σ = 835354624. Its totient is φ = 610590960.

The previous prime is 721616383. The next prime is 721616437. The reversal of 721616413 is 314616127.

It is not a de Polignac number, because 721616413 - 2¹³ = 721608221 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 (721616213) 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, 185656 + ... + 189502.

It is an arithmetic number, because the mean of its divisors is an integer number (52209664).

Almost surely, 2^721616413 is an apocalyptic number.

It is an amenable number.

721616413 is a deficient number, since it is larger than the sum of its proper divisors (113738211).

721616413 is a wasteful number, since it uses less digits than its factorization.

721616413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4192.

The product of its digits is 6048, while the sum is 31.

The square root of 721616413 is about 26862.9189218149. The cubic root of 721616413 is about 896.9511703133.

The spelling of 721616413 in words is "seven hundred twenty-one million, six hundred sixteen thousand, four hundred thirteen".