718427861 has 2 divisors, whose sum is σ = 718427862. Its totient is φ = 718427860.

The previous prime is 718427851. The next prime is 718427869. The reversal of 718427861 is 168724817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397803025 + 320624836 = 19945^2 + 17906^2 .

It is an emirp because it is prime and its reverse (168724817) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-718427861 is a prime.

It is a super-2 number, since 2×718427861² = 1032277182922070642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (718427869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359213930 + 359213931.

It is an arithmetic number, because the mean of its divisors is an integer number (359213931).

Almost surely, 2^718427861 is an apocalyptic number.

It is an amenable number.

718427861 is a deficient number, since it is larger than the sum of its proper divisors (1).

718427861 is an equidigital number, since it uses as much as digits as its factorization.

718427861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 44.

The square root of 718427861 is about 26803.5046402518. The cubic root of 718427861 is about 895.6281228912.

The spelling of 718427861 in words is "seven hundred eighteen million, four hundred twenty-seven thousand, eight hundred sixty-one".