989696957 has 2 divisors, whose sum is σ = 989696958. Its totient is φ = 989696956.

The previous prime is 989696921. The next prime is 989696971. The reversal of 989696957 is 759696989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 704053156 + 285643801 = 26534^2 + 16901^2 .

It is a cyclic number.

It is not a de Polignac number, because 989696957 - 2¹² = 989692861 is a prime.

It is a super-3 number, since 3×989696957³ (a number of 28 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989606957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494848478 + 494848479.

It is an arithmetic number, because the mean of its divisors is an integer number (494848479).

Almost surely, 2^989696957 is an apocalyptic number.

It is an amenable number.

989696957 is a deficient number, since it is larger than the sum of its proper divisors (1).

989696957 is an equidigital number, since it uses as much as digits as its factorization.

989696957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 66134880, while the sum is 68.

The square root of 989696957 is about 31459.4494071336. The cubic root of 989696957 is about 996.5537896101.

The spelling of 989696957 in words is "nine hundred eighty-nine million, six hundred ninety-six thousand, nine hundred fifty-seven".