87812849 has 2 divisors, whose sum is σ = 87812850. Its totient is φ = 87812848.

The previous prime is 87812831. The next prime is 87812887. The reversal of 87812849 is 94821878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75082225 + 12730624 = 8665^2 + 3568^2 .

It is a cyclic number.

It is not a de Polignac number, because 87812849 - 2²⁰ = 86764273 is a prime.

It is a super-2 number, since 2×87812849² = 15422192898993602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87812819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43906424 + 43906425.

It is an arithmetic number, because the mean of its divisors is an integer number (43906425).

Almost surely, 2^87812849 is an apocalyptic number.

It is an amenable number.

87812849 is a deficient number, since it is larger than the sum of its proper divisors (1).

87812849 is an equidigital number, since it uses as much as digits as its factorization.

87812849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 47.

The square root of 87812849 is about 9370.8510285886. The cubic root of 87812849 is about 444.4804760626.

The spelling of 87812849 in words is "eighty-seven million, eight hundred twelve thousand, eight hundred forty-nine".