718829521 has 4 divisors (see below), whose sum is σ = 719969344. Its totient is φ = 717689700.

The previous prime is 718829483. The next prime is 718829647. The reversal of 718829521 is 125928817.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-718829521 is a prime.

It is a super-2 number, since 2×718829521² = 1033431760522178882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (718829021) 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 3 ways as a sum of consecutive naturals, for example, 568965 + ... + 570226.

It is an arithmetic number, because the mean of its divisors is an integer number (179992336).

Almost surely, 2^718829521 is an apocalyptic number.

It is an amenable number.

718829521 is a deficient number, since it is larger than the sum of its proper divisors (1139823).

718829521 is a wasteful number, since it uses less digits than its factorization.

718829521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139822.

The product of its digits is 80640, while the sum is 43.

The square root of 718829521 is about 26810.9962701874. The cubic root of 718829521 is about 895.7950016140.

The spelling of 718829521 in words is "seven hundred eighteen million, eight hundred twenty-nine thousand, five hundred twenty-one".