718821401 has 4 divisors (see below), whose sum is σ = 722976612. Its totient is φ = 714666192.

The previous prime is 718821379. The next prime is 718821413. The reversal of 718821401 is 104128817.

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 623251225 + 95570176 = 24965^2 + 9776^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-718821401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (718821491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2077346 + ... + 2077691.

It is an arithmetic number, because the mean of its divisors is an integer number (180744153).

Almost surely, 2^718821401 is an apocalyptic number.

It is an amenable number.

718821401 is a deficient number, since it is larger than the sum of its proper divisors (4155211).

718821401 is a wasteful number, since it uses less digits than its factorization.

718821401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4155210.

The product of its (nonzero) digits is 3584, while the sum is 32.

The square root of 718821401 is about 26810.8448393556. The cubic root of 718821401 is about 895.7916285922.

The spelling of 718821401 in words is "seven hundred eighteen million, eight hundred twenty-one thousand, four hundred one".