916559121 has 4 divisors (see below), whose sum is σ = 1222078832. Its totient is φ = 611039412.

The previous prime is 916559117. The next prime is 916559179. The reversal of 916559121 is 121955619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 916559121 - 2² = 916559117 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 916559121.

It is not an unprimeable number, because it can be changed into a prime (916559101) 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 3 ways as a sum of consecutive naturals, for example, 152759851 + ... + 152759856.

It is an arithmetic number, because the mean of its divisors is an integer number (305519708).

Almost surely, 2^916559121 is an apocalyptic number.

It is an amenable number.

916559121 is a deficient number, since it is larger than the sum of its proper divisors (305519711).

916559121 is a wasteful number, since it uses less digits than its factorization.

916559121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305519710.

The product of its digits is 24300, while the sum is 39.

The square root of 916559121 is about 30274.7274306475. The cubic root of 916559121 is about 971.3747895161.

It can be divided in two parts, 9165 and 59121, that added together give a palindrome (68286).

The spelling of 916559121 in words is "nine hundred sixteen million, five hundred fifty-nine thousand, one hundred twenty-one".