989812127 has 2 divisors, whose sum is σ = 989812128. Its totient is φ = 989812126.

The previous prime is 989812111. The next prime is 989812129. The reversal of 989812127 is 721218989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 989812127 - 2⁴ = 989812111 is a prime.

Together with 989812129, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989812129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494906063 + 494906064.

It is an arithmetic number, because the mean of its divisors is an integer number (494906064).

Almost surely, 2^989812127 is an apocalyptic number.

989812127 is a deficient number, since it is larger than the sum of its proper divisors (1).

989812127 is an equidigital number, since it uses as much as digits as its factorization.

989812127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 47.

The square root of 989812127 is about 31461.2798055006. The cubic root of 989812127 is about 996.5924440849.

The spelling of 989812127 in words is "nine hundred eighty-nine million, eight hundred twelve thousand, one hundred twenty-seven".