97989121 has 2 divisors, whose sum is σ = 97989122. Its totient is φ = 97989120.

The previous prime is 97989097. The next prime is 97989149. The reversal of 97989121 is 12198979.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49547521 + 48441600 = 7039^2 + 6960^2 .

It is a cyclic number.

It is not a de Polignac number, because 97989121 - 2¹¹ = 97987073 is a prime.

It is not a weakly prime, because it can be changed into another prime (97989161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48994560 + 48994561.

It is an arithmetic number, because the mean of its divisors is an integer number (48994561).

Almost surely, 2^97989121 is an apocalyptic number.

It is an amenable number.

97989121 is a deficient number, since it is larger than the sum of its proper divisors (1).

97989121 is an equidigital number, since it uses as much as digits as its factorization.

97989121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 46.

The square root of 97989121 is about 9898.9454488849. The cubic root of 97989121 is about 461.0265683921.

It can be divided in two parts, 979 and 89121, that added together give a triangular number (90100 = T₄₂₄).

The spelling of 97989121 in words is "ninety-seven million, nine hundred eighty-nine thousand, one hundred twenty-one".