999654121 has 2 divisors, whose sum is σ = 999654122. Its totient is φ = 999654120.

The previous prime is 999654119. The next prime is 999654167. The reversal of 999654121 is 121456999.

It is a happy number.

It is an a-pointer prime, because the next prime (999654167) can be obtained adding 999654121 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 989794521 + 9859600 = 31461^2 + 3140^2 .

It is a cyclic number.

It is not a de Polignac number, because 999654121 - 2¹ = 999654119 is a prime.

Together with 999654119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (999654101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499827060 + 499827061.

It is an arithmetic number, because the mean of its divisors is an integer number (499827061).

Almost surely, 2^999654121 is an apocalyptic number.

It is an amenable number.

999654121 is a deficient number, since it is larger than the sum of its proper divisors (1).

999654121 is an equidigital number, since it uses as much as digits as its factorization.

999654121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 46.

The square root of 999654121 is about 31617.3073015398. The cubic root of 999654121 is about 999.8846937050.

The spelling of 999654121 in words is "nine hundred ninety-nine million, six hundred fifty-four thousand, one hundred twenty-one".