989694569 has 2 divisors, whose sum is σ = 989694570. Its totient is φ = 989694568.

The previous prime is 989694551. The next prime is 989694659. The reversal of 989694569 is 965496989.

Together with next prime (989694659) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 979690000 + 10004569 = 31300^2 + 3163^2 .

It is a cyclic number.

It is not a de Polignac number, because 989694569 - 2¹² = 989690473 is a prime.

It is a super-2 number, since 2×989694569² = 1958990679816191522, which contains 22 as substring.

It is a Chen prime.

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

It is not a weakly prime, because it can be changed into another prime (989694509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494847284 + 494847285.

It is an arithmetic number, because the mean of its divisors is an integer number (494847285).

Almost surely, 2^989694569 is an apocalyptic number.

It is an amenable number.

989694569 is a deficient number, since it is larger than the sum of its proper divisors (1).

989694569 is an equidigital number, since it uses as much as digits as its factorization.

989694569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37791360, while the sum is 65.

The square root of 989694569 is about 31459.4114534904. The cubic root of 989694569 is about 996.5529880946.

The spelling of 989694569 in words is "nine hundred eighty-nine million, six hundred ninety-four thousand, five hundred sixty-nine".