999271121 has 2 divisors, whose sum is σ = 999271122. Its totient is φ = 999271120.

The previous prime is 999271093. The next prime is 999271153. The reversal of 999271121 is 121172999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 941814721 + 57456400 = 30689^2 + 7580^2 .

It is a cyclic number.

It is not a de Polignac number, because 999271121 - 2⁶ = 999271057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999271171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499635560 + 499635561.

It is an arithmetic number, because the mean of its divisors is an integer number (499635561).

Almost surely, 2^999271121 is an apocalyptic number.

It is an amenable number.

999271121 is a deficient number, since it is larger than the sum of its proper divisors (1).

999271121 is an equidigital number, since it uses as much as digits as its factorization.

999271121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 41.

The square root of 999271121 is about 31611.2499120171. The cubic root of 999271121 is about 999.7569812800.

The spelling of 999271121 in words is "nine hundred ninety-nine million, two hundred seventy-one thousand, one hundred twenty-one".