161761125 has 16 divisors (see below), whose sum is σ = 269171136. Its totient is φ = 86272400.

The previous prime is 161761099. The next prime is 161761129. The reversal of 161761125 is 521167161.

It is not a de Polignac number, because 161761125 - 2⁷ = 161760997 is a prime.

It is a super-2 number, since 2×161761125² = 52333323122531250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161761092 and 161761101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161761129) 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 15 ways as a sum of consecutive naturals, for example, 215307 + ... + 216056.

It is an arithmetic number, because the mean of its divisors is an integer number (16823196).

Almost surely, 2^161761125 is an apocalyptic number.

161761125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161761125 is a deficient number, since it is larger than the sum of its proper divisors (107410011).

161761125 is an equidigital number, since it uses as much as digits as its factorization.

161761125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431381 (or 431371 counting only the distinct ones).

The product of its digits is 2520, while the sum is 30.

The square root of 161761125 is about 12718.5347033375. The cubic root of 161761125 is about 544.8681048838.

The spelling of 161761125 in words is "one hundred sixty-one million, seven hundred sixty-one thousand, one hundred twenty-five".