999996181 has 2 divisors, whose sum is σ = 999996182. Its totient is φ = 999996180.

The previous prime is 999996149. The next prime is 999996199. The reversal of 999996181 is 181699999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 510082225 + 489913956 = 22585^2 + 22134^2 .

It is a cyclic number.

It is not a de Polignac number, because 999996181 - 2⁵ = 999996149 is a prime.

It is a super-2 number, since 2×999996181² = 1999984724029169522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999996131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499998090 + 499998091.

It is an arithmetic number, because the mean of its divisors is an integer number (499998091).

Almost surely, 2^999996181 is an apocalyptic number.

It is an amenable number.

999996181 is a deficient number, since it is larger than the sum of its proper divisors (1).

999996181 is an equidigital number, since it uses as much as digits as its factorization.

999996181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2834352, while the sum is 61.

The square root of 999996181 is about 31622.7162179342. The cubic root of 999996181 is about 999.9987269984.

The spelling of 999996181 in words is "nine hundred ninety-nine million, nine hundred ninety-six thousand, one hundred eighty-one".