121004551 has 2 divisors, whose sum is σ = 121004552. Its totient is φ = 121004550.

The previous prime is 121004447. The next prime is 121004561. The reversal of 121004551 is 155400121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121004551 - 2⁷ = 121004423 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121004561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60502275 + 60502276.

It is an arithmetic number, because the mean of its divisors is an integer number (60502276).

Almost surely, 2^121004551 is an apocalyptic number.

121004551 is a deficient number, since it is larger than the sum of its proper divisors (1).

121004551 is an equidigital number, since it uses as much as digits as its factorization.

121004551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 121004551 is about 11000.2068616913. The cubic root of 121004551 is about 494.6149452510.

Adding to 121004551 its reverse (155400121), we get a palindrome (276404672).

The spelling of 121004551 in words is "one hundred twenty-one million, four thousand, five hundred fifty-one".