121874551 has 2 divisors, whose sum is σ = 121874552. Its totient is φ = 121874550.

The previous prime is 121874549. The next prime is 121874561. The reversal of 121874551 is 155478121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121874551 - 2¹ = 121874549 is a prime.

Together with 121874549, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121874561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60937275 + 60937276.

It is an arithmetic number, because the mean of its divisors is an integer number (60937276).

Almost surely, 2^121874551 is an apocalyptic number.

121874551 is a deficient number, since it is larger than the sum of its proper divisors (1).

121874551 is an equidigital number, since it uses as much as digits as its factorization.

121874551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11200, while the sum is 34.

The square root of 121874551 is about 11039.6807471955. The cubic root of 121874551 is about 495.7975118124.

The spelling of 121874551 in words is "one hundred twenty-one million, eight hundred seventy-four thousand, five hundred fifty-one".