921168616 has 8 divisors (see below), whose sum is σ = 1727191170. Its totient is φ = 460584304.

The previous prime is 921168587. The next prime is 921168617. The reversal of 921168616 is 616861129.

It can be written as a sum of positive squares in only one way, i.e., 907816900 + 13351716 = 30130^2 + 3654^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (921168617) 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 as a sum of consecutive naturals, namely, 57573031 + ... + 57573046.

Almost surely, 2^921168616 is an apocalyptic number.

It is an amenable number.

921168616 is a deficient number, since it is larger than the sum of its proper divisors (806022554).

921168616 is a wasteful number, since it uses less digits than its factorization.

921168616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115146083 (or 115146079 counting only the distinct ones).

The product of its digits is 31104, while the sum is 40.

The square root of 921168616 is about 30350.7597268998. The cubic root of 921168616 is about 973.0004573640. Note that the first 3 decimals are identical.

The spelling of 921168616 in words is "nine hundred twenty-one million, one hundred sixty-eight thousand, six hundred sixteen".