981101161 has 4 divisors (see below), whose sum is σ = 1038813012. Its totient is φ = 923389312.

The previous prime is 981101159. The next prime is 981101183. The reversal of 981101161 is 161101189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161101189 = 97 ⋅1660837.

It can be written as a sum of positive squares in 2 ways, for example, as 554885136 + 426216025 = 23556^2 + 20645^2 .

It is a cyclic number.

It is not a de Polignac number, because 981101161 - 2¹ = 981101159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981101131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28855900 + ... + 28855933.

It is an arithmetic number, because the mean of its divisors is an integer number (259703253).

Almost surely, 2^981101161 is an apocalyptic number.

It is an amenable number.

981101161 is a deficient number, since it is larger than the sum of its proper divisors (57711851).

981101161 is a wasteful number, since it uses less digits than its factorization.

981101161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57711850.

The product of its (nonzero) digits is 432, while the sum is 28.

The square root of 981101161 is about 31322.5343961819. The cubic root of 981101161 is about 993.6602798843.

Adding to 981101161 its sum of digits (28), we get a palindrome (981101189).

The spelling of 981101161 in words is "nine hundred eighty-one million, one hundred one thousand, one hundred sixty-one".