121616783 has 8 divisors (see below), whose sum is σ = 125057520. Its totient is φ = 118198720.

The previous prime is 121616773. The next prime is 121616797. The reversal of 121616783 is 387616121.

It is a Cunningham number, because it is equal to 11028²-1.

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-121616783 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121616773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5516 + ... + 16542.

It is an arithmetic number, because the mean of its divisors is an integer number (15632190).

Almost surely, 2^121616783 is an apocalyptic number.

121616783 is a deficient number, since it is larger than the sum of its proper divisors (3440737).

121616783 is a wasteful number, since it uses less digits than its factorization.

121616783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11337.

The product of its digits is 12096, while the sum is 35.

The square root of 121616783 is about 11027.9999546609. Note that the first 4 decimals coincide. The cubic root of 121616783 is about 495.4477233382.

The spelling of 121616783 in words is "one hundred twenty-one million, six hundred sixteen thousand, seven hundred eighty-three".