718964821 has 2 divisors, whose sum is σ = 718964822. Its totient is φ = 718964820.

The previous prime is 718964789. The next prime is 718964837. The reversal of 718964821 is 128469817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 490622500 + 228342321 = 22150^2 + 15111^2 .

It is a cyclic number.

It is not a de Polignac number, because 718964821 - 2⁵ = 718964789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (718964021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359482410 + 359482411.

It is an arithmetic number, because the mean of its divisors is an integer number (359482411).

Almost surely, 2^718964821 is an apocalyptic number.

It is an amenable number.

718964821 is a deficient number, since it is larger than the sum of its proper divisors (1).

718964821 is an equidigital number, since it uses as much as digits as its factorization.

718964821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 46.

The square root of 718964821 is about 26813.5193699000. The cubic root of 718964821 is about 895.8512010589.

It can be divided in two parts, 7189 and 64821, that added together give a triangular number (72010 = T₃₇₉).

The spelling of 718964821 in words is "seven hundred eighteen million, nine hundred sixty-four thousand, eight hundred twenty-one".