718121 has 2 divisors, whose sum is σ = 718122. Its totient is φ = 718120.

The previous prime is 718093. The next prime is 718139. The reversal of 718121 is 121817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 714025 + 4096 = 845^2 + 64^2 .

It is a cyclic number.

It is not a de Polignac number, because 718121 - 2¹⁸ = 455977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 718093 and 718102.

It is not a weakly prime, because it can be changed into another prime (718171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359060 + 359061.

It is an arithmetic number, because the mean of its divisors is an integer number (359061).

2⁷¹⁸¹²¹ is an apocalyptic number.

It is an amenable number.

718121 is a deficient number, since it is larger than the sum of its proper divisors (1).

718121 is an equidigital number, since it uses as much as digits as its factorization.

718121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112, while the sum is 20.

The square root of 718121 is about 847.4202027330. The cubic root of 718121 is about 89.5500588639.

Adding to 718121 its reverse (121817), we get a palindrome (839938).

It can be divided in two parts, 71 and 8121, that added together give a 13-th power (8192 = 2¹³).

The spelling of 718121 in words is "seven hundred eighteen thousand, one hundred twenty-one".