121710551 has 2 divisors, whose sum is σ = 121710552. Its totient is φ = 121710550.

The previous prime is 121710539. The next prime is 121710559. The reversal of 121710551 is 155017121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121710551 - 2²² = 117516247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121710559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60855275 + 60855276.

It is an arithmetic number, because the mean of its divisors is an integer number (60855276).

Almost surely, 2^121710551 is an apocalyptic number.

121710551 is a deficient number, since it is larger than the sum of its proper divisors (1).

121710551 is an equidigital number, since it uses as much as digits as its factorization.

121710551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 350, while the sum is 23.

The square root of 121710551 is about 11032.2504957058. The cubic root of 121710551 is about 495.5750226753.

Adding to 121710551 its reverse (155017121), we get a palindrome (276727672).

The spelling of 121710551 in words is "one hundred twenty-one million, seven hundred ten thousand, five hundred fifty-one".