121009997 has 2 divisors, whose sum is σ = 121009998. Its totient is φ = 121009996.

The previous prime is 121009991. The next prime is 121010033. The reversal of 121009997 is 799900121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111112681 + 9897316 = 10541^2 + 3146^2 .

It is a cyclic number.

It is not a de Polignac number, because 121009997 - 2⁴ = 121009981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121009997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121009991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60504998 + 60504999.

It is an arithmetic number, because the mean of its divisors is an integer number (60504999).

Almost surely, 2^121009997 is an apocalyptic number.

It is an amenable number.

121009997 is a deficient number, since it is larger than the sum of its proper divisors (1).

121009997 is an equidigital number, since it uses as much as digits as its factorization.

121009997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 38.

The square root of 121009997 is about 11000.4543997055. The cubic root of 121009997 is about 494.6223654473.

The spelling of 121009997 in words is "one hundred twenty-one million, nine thousand, nine hundred ninety-seven".