718879781 has 2 divisors, whose sum is σ = 718879782. Its totient is φ = 718879780.

The previous prime is 718879703. The next prime is 718879807. The reversal of 718879781 is 187978817.

718879781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 667757281 + 51122500 = 25841^2 + 7150^2 .

It is a cyclic number.

It is not a de Polignac number, because 718879781 - 2¹⁰ = 718878757 is a prime.

It is a super-2 number, since 2×718879781² = 1033576279061215922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (718879081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359439890 + 359439891.

It is an arithmetic number, because the mean of its divisors is an integer number (359439891).

Almost surely, 2^718879781 is an apocalyptic number.

It is an amenable number.

718879781 is a deficient number, since it is larger than the sum of its proper divisors (1).

718879781 is an equidigital number, since it uses as much as digits as its factorization.

718879781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1580544, while the sum is 56.

The square root of 718879781 is about 26811.9335557882. The cubic root of 718879781 is about 895.8158788903.

The spelling of 718879781 in words is "seven hundred eighteen million, eight hundred seventy-nine thousand, seven hundred eighty-one".