999761161 has 9 divisors (see below), whose sum is σ = 1163244999. Its totient is φ = 856748424.

The previous prime is 999761123. The next prime is 999761183. The reversal of 999761161 is 161167999.

It is a happy number.

The square root of 999761161 is 31619.

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

999761161 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., 3980025 + 995781136 = 1995^2 + 31556^2 .

It is not a de Polignac number, because 999761161 - 2¹³ = 999752969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (999761561) 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, 219075 + ... + 223591.

Almost surely, 2^999761161 is an apocalyptic number.

999761161 is the 31619-th square number.

999761161 is the 15810-th centered octagonal number.

It is an amenable number.

999761161 is a deficient number, since it is larger than the sum of its proper divisors (163483838).

999761161 is an frugal number, since it uses more digits than its factorization.

999761161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9048 (or 4524 counting only the distinct ones).

The product of its digits is 183708, while the sum is 49.

The cubic root of 999761161 is about 999.9203806609.

Multiplying 999761161 by its sum of digits (49), we get a square (48988296889 = 221333²).

999761161 divided by its sum of digits (49) gives a square (20403289 = 4517²).

The spelling of 999761161 in words is "nine hundred ninety-nine million, seven hundred sixty-one thousand, one hundred sixty-one".