718917145 has 4 divisors (see below), whose sum is σ = 862700580. Its totient is φ = 575133712.

The previous prime is 718917139. The next prime is 718917161. The reversal of 718917145 is 541719817.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 288728064 + 430189081 = 16992^2 + 20741^2 .

It is a cyclic number.

It is not a de Polignac number, because 718917145 - 2³ = 718917137 is a prime.

It is a super-2 number, since 2×718917145² = 1033683722749902050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71891710 + ... + 71891719.

It is an arithmetic number, because the mean of its divisors is an integer number (215675145).

Almost surely, 2^718917145 is an apocalyptic number.

It is an amenable number.

718917145 is a deficient number, since it is larger than the sum of its proper divisors (143783435).

718917145 is a wasteful number, since it uses less digits than its factorization.

718917145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143783434.

The product of its digits is 70560, while the sum is 43.

The square root of 718917145 is about 26812.6303260236. The cubic root of 718917145 is about 895.8313987243.

The spelling of 718917145 in words is "seven hundred eighteen million, nine hundred seventeen thousand, one hundred forty-five".