161695925 has 12 divisors (see below), whose sum is σ = 212297796. Its totient is φ = 121747200.

The previous prime is 161695921. The next prime is 161695943. The reversal of 161695925 is 529596161.

It can be written as a sum of positive squares in 6 ways, for example, as 7091569 + 154604356 = 2663^2 + 12434^2 .

It is not a de Polignac number, because 161695925 - 2² = 161695921 is a prime.

It is a super-2 number, since 2×161695925² = 52291144323211250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161695921) 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 11 ways as a sum of consecutive naturals, for example, 189806 + ... + 190655.

It is an arithmetic number, because the mean of its divisors is an integer number (17691483).

Almost surely, 2^161695925 is an apocalyptic number.

It is an amenable number.

161695925 is a deficient number, since it is larger than the sum of its proper divisors (50601871).

161695925 is a wasteful number, since it uses less digits than its factorization.

161695925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380488 (or 380483 counting only the distinct ones).

The product of its digits is 145800, while the sum is 44.

The square root of 161695925 is about 12715.9712566520. The cubic root of 161695925 is about 544.7948895701.

The spelling of 161695925 in words is "one hundred sixty-one million, six hundred ninety-five thousand, nine hundred twenty-five".