161125769 has 24 divisors (see below), whose sum is σ = 195453000. Its totient is φ = 132276480.

The previous prime is 161125763. The next prime is 161125771. The reversal of 161125769 is 967521161.

It can be written as a sum of positive squares in 4 ways, for example, as 5175625 + 155950144 = 2275^2 + 12488^2 .

It is not a de Polignac number, because 161125769 - 2¹² = 161121673 is a prime.

It is a super-2 number, since 2×161125769² = 51923026871682722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161125763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 211349 + ... + 212109.

It is an arithmetic number, because the mean of its divisors is an integer number (8143875).

Almost surely, 2^161125769 is an apocalyptic number.

It is an amenable number.

161125769 is a deficient number, since it is larger than the sum of its proper divisors (34327231).

161125769 is a wasteful number, since it uses less digits than its factorization.

161125769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953 (or 946 counting only the distinct ones).

The product of its digits is 22680, while the sum is 38.

The square root of 161125769 is about 12693.5325658384. The cubic root of 161125769 is about 544.1538017133.

The spelling of 161125769 in words is "one hundred sixty-one million, one hundred twenty-five thousand, seven hundred sixty-nine".