121690555 has 8 divisors (see below), whose sum is σ = 166889952. Its totient is φ = 83444928.

The previous prime is 121690549. The next prime is 121690561. The reversal of 121690555 is 555096121.

It is an interprime number because it is at equal distance from previous prime (121690549) and next prime (121690561).

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

It is not a de Polignac number, because 121690555 - 2⁷ = 121690427 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121690555.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1738402 + ... + 1738471.

It is an arithmetic number, because the mean of its divisors is an integer number (20861244).

Almost surely, 2^121690555 is an apocalyptic number.

121690555 is a deficient number, since it is larger than the sum of its proper divisors (45199397).

121690555 is an equidigital number, since it uses as much as digits as its factorization.

121690555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3476885.

The product of its (nonzero) digits is 13500, while the sum is 34.

The square root of 121690555 is about 11031.3442063966. The cubic root of 121690555 is about 495.5478816131.

The spelling of 121690555 in words is "one hundred twenty-one million, six hundred ninety thousand, five hundred fifty-five".