161234520 has 64 divisors (see below), whose sum is σ = 494968320. Its totient is φ = 41994624.

The previous prime is 161234473. The next prime is 161234527. The reversal of 161234520 is 25432161.

161234520 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 (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161234527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10464 + ... + 20783.

It is an arithmetic number, because the mean of its divisors is an integer number (7733880).

Almost surely, 2^161234520 is an apocalyptic number.

161234520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161234520 is an abundant number, since it is smaller than the sum of its proper divisors (333733800).

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

161234520 is a wasteful number, since it uses less digits than its factorization.

161234520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31304 (or 31300 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 161234520 is about 12697.8155601662. The cubic root of 161234520 is about 544.2761987733.

Adding to 161234520 its reverse (25432161), we get a palindrome (186666681).

The spelling of 161234520 in words is "one hundred sixty-one million, two hundred thirty-four thousand, five hundred twenty".