99870919 has 2 divisors, whose sum is σ = 99870920. Its totient is φ = 99870918.

The previous prime is 99870877. The next prime is 99870929. The reversal of 99870919 is 91907899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99870919 - 2¹¹ = 99868871 is a prime.

It is a super-2 number, since 2×99870919² = 19948400923809122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99870929) 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, 49935459 + 49935460.

It is an arithmetic number, because the mean of its divisors is an integer number (49935460).

Almost surely, 2^99870919 is an apocalyptic number.

99870919 is a deficient number, since it is larger than the sum of its proper divisors (1).

99870919 is an equidigital number, since it uses as much as digits as its factorization.

99870919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 99870919 is about 9993.5438659166. The cubic root of 99870919 is about 463.9590837261.

It can be divided in two parts, 998 and 70919, that added together give a palindrome (71917).

The spelling of 99870919 in words is "ninety-nine million, eight hundred seventy thousand, nine hundred nineteen".