160981769 has 8 divisors (see below), whose sum is σ = 173656392. Its totient is φ = 148348800.

The previous prime is 160981763. The next prime is 160981781. The reversal of 160981769 is 967189061.

It can be written as a sum of positive squares in 4 ways, for example, as 44622400 + 116359369 = 6680^2 + 10787^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 160981769 - 2⁴ = 160981753 is a prime.

It is a super-2 number, since 2×160981769² = 51830259900738722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (160981763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2132 + ... + 18069.

It is an arithmetic number, because the mean of its divisors is an integer number (21707049).

Almost surely, 2^160981769 is an apocalyptic number.

It is an amenable number.

160981769 is a deficient number, since it is larger than the sum of its proper divisors (12674623).

160981769 is a wasteful number, since it uses less digits than its factorization.

160981769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20827.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 160981769 is about 12687.8591180703. The cubic root of 160981769 is about 543.9916478407.

The spelling of 160981769 in words is "one hundred sixty million, nine hundred eighty-one thousand, seven hundred sixty-nine".