818812137 has 32 divisors (see below), whose sum is σ = 1287530496. Its totient is φ = 456321600.

The previous prime is 818812133. The next prime is 818812153. The reversal of 818812137 is 731218818.

It is not a de Polignac number, because 818812137 - 2² = 818812133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 818812095 and 818812104.

It is not an unprimeable number, because it can be changed into a prime (818812133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112738 + ... + 119780.

It is an arithmetic number, because the mean of its divisors is an integer number (40235328).

Almost surely, 2^818812137 is an apocalyptic number.

It is an amenable number.

818812137 is a deficient number, since it is larger than the sum of its proper divisors (468718359).

818812137 is a wasteful number, since it uses less digits than its factorization.

818812137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7341.

The product of its digits is 21504, while the sum is 39.

The square root of 818812137 is about 28614.8936220284. The cubic root of 818812137 is about 935.5379812636.

The spelling of 818812137 in words is "eight hundred eighteen million, eight hundred twelve thousand, one hundred thirty-seven".