97979009 has 2 divisors, whose sum is σ = 97979010. Its totient is φ = 97979008.

The previous prime is 97978987. The next prime is 97979047. The reversal of 97979009 is 90097979.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62457409 + 35521600 = 7903^2 + 5960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97979009 is a prime.

It is not a weakly prime, because it can be changed into another prime (97979209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48989504 + 48989505.

It is an arithmetic number, because the mean of its divisors is an integer number (48989505).

Almost surely, 2^97979009 is an apocalyptic number.

It is an amenable number.

97979009 is a deficient number, since it is larger than the sum of its proper divisors (1).

97979009 is an equidigital number, since it uses as much as digits as its factorization.

97979009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 321489, while the sum is 50.

The square root of 97979009 is about 9898.4346742301. The cubic root of 97979009 is about 461.0107092811.

The spelling of 97979009 in words is "ninety-seven million, nine hundred seventy-nine thousand, nine".