716281921 has 4 divisors (see below), whose sum is σ = 716699844. Its totient is φ = 715864000.

The previous prime is 716281919. The next prime is 716281957. The reversal of 716281921 is 129182617.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 472453696 + 243828225 = 21736^2 + 15615^2 .

It is a cyclic number.

It is not a de Polignac number, because 716281921 - 2¹ = 716281919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (716281721) 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, 206380 + ... + 209821.

It is an arithmetic number, because the mean of its divisors is an integer number (179174961).

Almost surely, 2^716281921 is an apocalyptic number.

It is an amenable number.

716281921 is a deficient number, since it is larger than the sum of its proper divisors (417923).

716281921 is a wasteful number, since it uses less digits than its factorization.

716281921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417922.

The product of its digits is 12096, while the sum is 37.

The square root of 716281921 is about 26763.4437432854. The cubic root of 716281921 is about 894.7354881385.

The spelling of 716281921 in words is "seven hundred sixteen million, two hundred eighty-one thousand, nine hundred twenty-one".