161541252 has 36 divisors (see below), whose sum is σ = 422423820. Its totient is φ = 51989952.

The previous prime is 161541241. The next prime is 161541257. The reversal of 161541252 is 252145161.

161541252 is a `hidden beast` number, since 1 + 615 + 41 + 2 + 5 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 77158656 + 84382596 = 8784^2 + 9186^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (161541257) 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 11 ways as a sum of consecutive naturals, for example, 76323 + ... + 78410.

It is an arithmetic number, because the mean of its divisors is an integer number (11733995).

Almost surely, 2^161541252 is an apocalyptic number.

161541252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161541252 is an abundant number, since it is smaller than the sum of its proper divisors (260882568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161541252 is a wasteful number, since it uses less digits than its factorization.

161541252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154772 (or 154767 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 161541252 is about 12709.8879617407. The cubic root of 161541252 is about 544.6211231984.

The spelling of 161541252 in words is "one hundred sixty-one million, five hundred forty-one thousand, two hundred fifty-two".