784616121 has 9 divisors (see below), whose sum is σ = 1133455791. Its totient is φ = 523021392.

The previous prime is 784616051. The next prime is 784616149. The reversal of 784616121 is 121616487.

It is a happy number.

The square root of 784616121 is 28011.

It is a perfect power (a square), and thus also a powerful number.

784616121 is a `hidden beast` number, since 78 + 461 + 6 + 121 = 666.

784616121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 744471225 + 40144896 = 27285^2 + 6336^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 784616121 - 2⁹ = 784615609 is a prime.

It is a super-3 number, since 3×784616121³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (784616321) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 79365 + ... + 88701.

Almost surely, 2^784616121 is an apocalyptic number.

784616121 is the 28011-st square number.

784616121 is the 14006-th centered octagonal number.

It is an amenable number.

784616121 is a deficient number, since it is larger than the sum of its proper divisors (348839670).

784616121 is an frugal number, since it uses more digits than its factorization.

784616121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18680 (or 9340 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The cubic root of 784616121 is about 922.3287416459.

Multiplying 784616121 by its sum of digits (36), we get a square (28246180356 = 168066²).

The spelling of 784616121 in words is "seven hundred eighty-four million, six hundred sixteen thousand, one hundred twenty-one".