121611905 has 8 divisors (see below), whose sum is σ = 146809152. Its totient is φ = 96706288.

The previous prime is 121611899. The next prime is 121611911. The reversal of 121611905 is 509116121.

It is an interprime number because it is at equal distance from previous prime (121611899) and next prime (121611911).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121611905 is a prime.

It is a Duffinian number.

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, 71987 + ... + 73656.

It is an arithmetic number, because the mean of its divisors is an integer number (18351144).

Almost surely, 2^121611905 is an apocalyptic number.

It is an amenable number.

121611905 is a deficient number, since it is larger than the sum of its proper divisors (25197247).

121611905 is a wasteful number, since it uses less digits than its factorization.

121611905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145815.

The product of its (nonzero) digits is 540, while the sum is 26.

The square root of 121611905 is about 11027.7787881332. The cubic root of 121611905 is about 495.4410991803.

The spelling of 121611905 in words is "one hundred twenty-one million, six hundred eleven thousand, nine hundred five".