161542120 has 32 divisors (see below), whose sum is σ = 367561800. Its totient is φ = 63889408.

The previous prime is 161542081. The next prime is 161542163. The reversal of 161542120 is 21245161.

161542120 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 109788484 + 51753636 = 10478^2 + 7194^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161542091 and 161542100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19129 + ... + 26248.

Almost surely, 2^161542120 is an apocalyptic number.

161542120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161542120 is an abundant number, since it is smaller than the sum of its proper divisors (206019680).

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

161542120 is a wasteful number, since it uses less digits than its factorization.

161542120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45477 (or 45473 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 161542120 is about 12709.9221083372. The cubic root of 161542120 is about 544.6220986567.

Adding to 161542120 its reverse (21245161), we get a palindrome (182787281).

It can be divided in two parts, 1615421 and 20, that added together give a square (1615441 = 1271²).

The spelling of 161542120 in words is "one hundred sixty-one million, five hundred forty-two thousand, one hundred twenty".