121688623 has 8 divisors (see below), whose sum is σ = 139794848. Its totient is φ = 103762944.

The previous prime is 121688603. The next prime is 121688627. The reversal of 121688623 is 326886121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 121688623 - 2⁹ = 121688111 is a prime.

It is a super-2 number, since 2×121688623² = 29616241935272258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121688627) 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, 43686 + ... + 46387.

It is an arithmetic number, because the mean of its divisors is an integer number (17474356).

Almost surely, 2^121688623 is an apocalyptic number.

121688623 is a deficient number, since it is larger than the sum of its proper divisors (18106225).

121688623 is an equidigital number, since it uses as much as digits as its factorization.

121688623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90273.

The product of its digits is 27648, while the sum is 37.

The square root of 121688623 is about 11031.2566373918. The cubic root of 121688623 is about 495.5452591045.

The spelling of 121688623 in words is "one hundred twenty-one million, six hundred eighty-eight thousand, six hundred twenty-three".