872818249 has 4 divisors (see below), whose sum is σ = 902915460. Its totient is φ = 842721040.

The previous prime is 872818241. The next prime is 872818259. The reversal of 872818249 is 942818278.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 942818278 = 2 ⋅471409139.

It can be written as a sum of positive squares in 2 ways, for example, as 554838025 + 317980224 = 23555^2 + 17832^2 .

It is a cyclic number.

It is not a de Polignac number, because 872818249 - 2³ = 872818241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (872818241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15048562 + ... + 15048619.

It is an arithmetic number, because the mean of its divisors is an integer number (225728865).

Almost surely, 2^872818249 is an apocalyptic number.

It is an amenable number.

872818249 is a deficient number, since it is larger than the sum of its proper divisors (30097211).

872818249 is a wasteful number, since it uses less digits than its factorization.

872818249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30097210.

The product of its digits is 516096, while the sum is 49.

The square root of 872818249 is about 29543.4975756087. The cubic root of 872818249 is about 955.6699698351.

The spelling of 872818249 in words is "eight hundred seventy-two million, eight hundred eighteen thousand, two hundred forty-nine".