551503000121 has 2 divisors, whose sum is σ = 551503000122. Its totient is φ = 551503000120.

The previous prime is 551503000117. The next prime is 551503000141. The reversal of 551503000121 is 121000305155.

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., 406966167721 + 144536832400 = 637939^2 + 380180^2 .

It is a cyclic number.

It is not a de Polignac number, because 551503000121 - 2² = 551503000117 is a prime.

It is not a weakly prime, because it can be changed into another prime (551503000141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275751500060 + 275751500061.

It is an arithmetic number, because the mean of its divisors is an integer number (275751500061).

Almost surely, 2^551503000121 is an apocalyptic number.

It is an amenable number.

551503000121 is a deficient number, since it is larger than the sum of its proper divisors (1).

551503000121 is an equidigital number, since it uses as much as digits as its factorization.

551503000121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 750, while the sum is 23.

Adding to 551503000121 its reverse (121000305155), we get a palindrome (672503305276).

The spelling of 551503000121 in words is "five hundred fifty-one billion, five hundred three million, one hundred twenty-one", and thus it is an aban number.