718011821 has 2 divisors, whose sum is σ = 718011822. Its totient is φ = 718011820.

The previous prime is 718011799. The next prime is 718011823. The reversal of 718011821 is 128110817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 649536196 + 68475625 = 25486^2 + 8275^2 .

It is a cyclic number.

It is not a de Polignac number, because 718011821 - 2⁶ = 718011757 is a prime.

Together with 718011823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (718011823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359005910 + 359005911.

It is an arithmetic number, because the mean of its divisors is an integer number (359005911).

Almost surely, 2^718011821 is an apocalyptic number.

It is an amenable number.

718011821 is a deficient number, since it is larger than the sum of its proper divisors (1).

718011821 is an equidigital number, since it uses as much as digits as its factorization.

718011821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 29.

The square root of 718011821 is about 26795.7425909416. The cubic root of 718011821 is about 895.4552040801.

The spelling of 718011821 in words is "seven hundred eighteen million, eleven thousand, eight hundred twenty-one".