989951071 has 2 divisors, whose sum is σ = 989951072. Its totient is φ = 989951070.

The previous prime is 989951069. The next prime is 989951093. The reversal of 989951071 is 170159989.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 989951071 - 2¹ = 989951069 is a prime.

Together with 989951069, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989951051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494975535 + 494975536.

It is an arithmetic number, because the mean of its divisors is an integer number (494975536).

Almost surely, 2^989951071 is an apocalyptic number.

989951071 is a deficient number, since it is larger than the sum of its proper divisors (1).

989951071 is an equidigital number, since it uses as much as digits as its factorization.

989951071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 49.

The square root of 989951071 is about 31463.4879026468. The cubic root of 989951071 is about 996.6390738301.

The spelling of 989951071 in words is "nine hundred eighty-nine million, nine hundred fifty-one thousand, seventy-one".