818136145 has 4 divisors (see below), whose sum is σ = 981763380. Its totient is φ = 654508912.

The previous prime is 818136091. The next prime is 818136161. The reversal of 818136145 is 541631818.

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 420373009 + 397763136 = 20503^2 + 19944^2 .

It is a cyclic number.

It is not a de Polignac number, because 818136145 - 2²⁹ = 281265233 is a prime.

It is a super-2 number, since 2×818136145² = 1338693503510922050, 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, 81813610 + ... + 81813619.

It is an arithmetic number, because the mean of its divisors is an integer number (245440845).

Almost surely, 2^818136145 is an apocalyptic number.

It is an amenable number.

818136145 is a deficient number, since it is larger than the sum of its proper divisors (163627235).

818136145 is a wasteful number, since it uses less digits than its factorization.

818136145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163627234.

The product of its digits is 23040, while the sum is 37.

The square root of 818136145 is about 28603.0792922720. The cubic root of 818136145 is about 935.2804576802.

The spelling of 818136145 in words is "eight hundred eighteen million, one hundred thirty-six thousand, one hundred forty-five".