121551000517 has 2 divisors, whose sum is σ = 121551000518. Its totient is φ = 121551000516.

The previous prime is 121551000511. The next prime is 121551000559. The reversal of 121551000517 is 715000155121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117951720481 + 3599280036 = 343441^2 + 59994^2 .

It is a cyclic number.

It is not a de Polignac number, because 121551000517 - 2³⁵ = 87191262149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121551000511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60775500258 + 60775500259.

It is an arithmetic number, because the mean of its divisors is an integer number (60775500259).

Almost surely, 2^121551000517 is an apocalyptic number.

It is an amenable number.

121551000517 is a deficient number, since it is larger than the sum of its proper divisors (1).

121551000517 is an equidigital number, since it uses as much as digits as its factorization.

121551000517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1750, while the sum is 28.

Adding to 121551000517 its reverse (715000155121), we get a palindrome (836551155638).

The spelling of 121551000517 in words is "one hundred twenty-one billion, five hundred fifty-one million, five hundred seventeen", and thus it is an aban number.