161230520 has 32 divisors (see below), whose sum is σ = 395748720. Its totient is φ = 58629120.

The previous prime is 161230507. The next prime is 161230541. The reversal of 161230520 is 25032161.

161230520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 161230492 and 161230501.

It is a congruent number.

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, 182777 + ... + 183656.

Almost surely, 2^161230520 is an apocalyptic number.

161230520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161230520 is an abundant number, since it is smaller than the sum of its proper divisors (234518200).

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

161230520 is a wasteful number, since it uses less digits than its factorization.

161230520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366455 (or 366451 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 161230520 is about 12697.6580517826. The cubic root of 161230520 is about 544.2716978290.

Adding to 161230520 its reverse (25032161), we get a palindrome (186262681).

It can be divided in two parts, 1612 and 30520, that multiplied together give a triangular number (49198240 = T₉₉₁₉).

The spelling of 161230520 in words is "one hundred sixty-one million, two hundred thirty thousand, five hundred twenty".