121563997 has 2 divisors, whose sum is σ = 121563998. Its totient is φ = 121563996.

The previous prime is 121563983. The next prime is 121564007. The reversal of 121563997 is 799365121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118504996 + 3059001 = 10886^2 + 1749^2 .

It is a cyclic number.

It is not a de Polignac number, because 121563997 - 2¹¹ = 121561949 is a prime.

It is equal to p_6925597 and since 121563997 and 6925597 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121563977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60781998 + 60781999.

It is an arithmetic number, because the mean of its divisors is an integer number (60781999).

Almost surely, 2^121563997 is an apocalyptic number.

It is an amenable number.

121563997 is a deficient number, since it is larger than the sum of its proper divisors (1).

121563997 is an equidigital number, since it uses as much as digits as its factorization.

121563997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102060, while the sum is 43.

The square root of 121563997 is about 11025.6064232313. The cubic root of 121563997 is about 495.3760323332.

The spelling of 121563997 in words is "one hundred twenty-one million, five hundred sixty-three thousand, nine hundred ninety-seven".