999892381 has 2 divisors, whose sum is σ = 999892382. Its totient is φ = 999892380.

The previous prime is 999892351. The next prime is 999892427. The reversal of 999892381 is 183298999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 896463481 + 103428900 = 29941^2 + 10170^2 .

It is a cyclic number.

It is not a de Polignac number, because 999892381 - 2¹⁹ = 999368093 is a prime.

It is a super-2 number, since 2×999892381² = 1999569547163698322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999892351) 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, 499946190 + 499946191.

It is an arithmetic number, because the mean of its divisors is an integer number (499946191).

Almost surely, 2^999892381 is an apocalyptic number.

It is an amenable number.

999892381 is a deficient number, since it is larger than the sum of its proper divisors (1).

999892381 is an equidigital number, since it uses as much as digits as its factorization.

999892381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 58.

The square root of 999892381 is about 31621.0749501025. The cubic root of 999892381 is about 999.9641257131.

The spelling of 999892381 in words is "nine hundred ninety-nine million, eight hundred ninety-two thousand, three hundred eighty-one".