940161005161 has 9 divisors (see below), whose sum is σ = 1093664574999. Its totient is φ = 805846472424.

The previous prime is 940161005153. The next prime is 940161005183. The reversal of 940161005161 is 161500161049.

The square root of 940161005161 is 969619.

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

It can be written as a sum of positive squares in only one way, i.e., 297848520025 + 642312485136 = 545755^2 + 801444^2 .

It is not a de Polignac number, because 940161005161 - 2³ = 940161005153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (940161005461) 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, 6718075 + ... + 6856591.

It is an arithmetic number, because the mean of its divisors is an integer number (121518286111).

Almost surely, 2^940161005161 is an apocalyptic number.

940161005161 is the 969619-th square number.

940161005161 is the 484810-th centered octagonal number.

It is an amenable number.

940161005161 is a deficient number, since it is larger than the sum of its proper divisors (153503569838).

940161005161 is an frugal number, since it uses more digits than its factorization.

940161005161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277048 (or 138524 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 34.

The spelling of 940161005161 in words is "nine hundred forty billion, one hundred sixty-one million, five thousand, one hundred sixty-one".