989870069 has 2 divisors, whose sum is σ = 989870070. Its totient is φ = 989870068.

The previous prime is 989870053. The next prime is 989870087. The reversal of 989870069 is 960078989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 969575044 + 20295025 = 31138^2 + 4505^2 .

It is a cyclic number.

It is not a de Polignac number, because 989870069 - 2⁴ = 989870053 is a prime.

It is a super-2 number, since 2×989870069² = 1959685507004129522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 989869996 and 989870023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989870009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494935034 + 494935035.

It is an arithmetic number, because the mean of its divisors is an integer number (494935035).

Almost surely, 2^989870069 is an apocalyptic number.

It is an amenable number.

989870069 is a deficient number, since it is larger than the sum of its proper divisors (1).

989870069 is an equidigital number, since it uses as much as digits as its factorization.

989870069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 989870069 is about 31462.2006382262. The cubic root of 989870069 is about 996.6118900084.

The spelling of 989870069 in words is "nine hundred eighty-nine million, eight hundred seventy thousand, sixty-nine".