97829989 has 2 divisors, whose sum is σ = 97829990. Its totient is φ = 97829988.

The previous prime is 97829981. The next prime is 97830037. The reversal of 97829989 is 98992879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97121025 + 708964 = 9855^2 + 842^2 .

It is a cyclic number.

It is not a de Polignac number, because 97829989 - 2³ = 97829981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97829981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48914994 + 48914995.

It is an arithmetic number, because the mean of its divisors is an integer number (48914995).

Almost surely, 2^97829989 is an apocalyptic number.

It is an amenable number.

97829989 is a deficient number, since it is larger than the sum of its proper divisors (1).

97829989 is an equidigital number, since it uses as much as digits as its factorization.

97829989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 61.

The square root of 97829989 is about 9890.9043570343. The cubic root of 97829989 is about 460.7768677830.

The spelling of 97829989 in words is "ninety-seven million, eight hundred twenty-nine thousand, nine hundred eighty-nine".