121707551 has 8 divisors (see below), whose sum is σ = 139188864. Its totient is φ = 104249880.

The previous prime is 121707533. The next prime is 121707583. The reversal of 121707551 is 155707121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121707551 - 2²² = 117513247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121707511) 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 in 7 ways as a sum of consecutive naturals, for example, 7016 + ... + 17106.

It is an arithmetic number, because the mean of its divisors is an integer number (17398608).

Almost surely, 2^121707551 is an apocalyptic number.

121707551 is a deficient number, since it is larger than the sum of its proper divisors (17481313).

121707551 is a wasteful number, since it uses less digits than its factorization.

121707551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11821.

The product of its (nonzero) digits is 2450, while the sum is 29.

The square root of 121707551 is about 11032.1145298624. The cubic root of 121707551 is about 495.5709508911.

The spelling of 121707551 in words is "one hundred twenty-one million, seven hundred seven thousand, five hundred fifty-one".