121670551 has 2 divisors, whose sum is σ = 121670552. Its totient is φ = 121670550.

The previous prime is 121670543. The next prime is 121670557. The reversal of 121670551 is 155076121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121670551 - 2³ = 121670543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121670557) 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, 60835275 + 60835276.

It is an arithmetic number, because the mean of its divisors is an integer number (60835276).

Almost surely, 2^121670551 is an apocalyptic number.

121670551 is a deficient number, since it is larger than the sum of its proper divisors (1).

121670551 is an equidigital number, since it uses as much as digits as its factorization.

121670551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 121670551 is about 11030.4374799914. The cubic root of 121670551 is about 495.5207267172.

It can be divided in two parts, 121670 and 551, that added together give a palindrome (122221).

The spelling of 121670551 in words is "one hundred twenty-one million, six hundred seventy thousand, five hundred fifty-one".