994127129 has 2 divisors, whose sum is σ = 994127130. Its totient is φ = 994127128.

The previous prime is 994127117. The next prime is 994127131. The reversal of 994127129 is 921721499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 883456729 + 110670400 = 29723^2 + 10520^2 .

It is an emirp because it is prime and its reverse (921721499) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-994127129 is a prime.

It is a super-2 number, since 2×994127129² = 1976577497227565282, which contains 22 as substring.

Together with 994127131, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 994127129.

It is not a weakly prime, because it can be changed into another prime (994127159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497063564 + 497063565.

It is an arithmetic number, because the mean of its divisors is an integer number (497063565).

Almost surely, 2^994127129 is an apocalyptic number.

It is an amenable number.

994127129 is a deficient number, since it is larger than the sum of its proper divisors (1).

994127129 is an equidigital number, since it uses as much as digits as its factorization.

994127129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 994127129 is about 31529.7816199225. The cubic root of 994127129 is about 998.0385314901.

The spelling of 994127129 in words is "nine hundred ninety-four million, one hundred twenty-seven thousand, one hundred twenty-nine".