98979997 has 2 divisors, whose sum is σ = 98979998. Its totient is φ = 98979996.

The previous prime is 98979989. The next prime is 98980009. The reversal of 98979997 is 79997989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94361796 + 4618201 = 9714^2 + 2149^2 .

It is an emirp because it is prime and its reverse (79997989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98979997 - 2³ = 98979989 is a prime.

It is a super-2 number, since 2×98979997² = 19594079612240018, which contains 22 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 (98979917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49489998 + 49489999.

It is an arithmetic number, because the mean of its divisors is an integer number (49489999).

Almost surely, 2^98979997 is an apocalyptic number.

It is an amenable number.

98979997 is a deficient number, since it is larger than the sum of its proper divisors (1).

98979997 is an equidigital number, since it uses as much as digits as its factorization.

98979997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23147208, while the sum is 67.

The square root of 98979997 is about 9948.8691317154. The cubic root of 98979997 is about 462.5753421939.

The spelling of 98979997 in words is "ninety-eight million, nine hundred seventy-nine thousand, nine hundred ninety-seven".