161435520 has 96 divisors (see below), whose sum is σ = 557476920. Its totient is φ = 43047936.

The previous prime is 161435503. The next prime is 161435539. The reversal of 161435520 is 25534161.

161435520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×161435520² = 52122854235340800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8254 + ... + 19773.

Almost surely, 2^161435520 is an apocalyptic number.

161435520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161435520 is an abundant number, since it is smaller than the sum of its proper divisors (396041400).

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

161435520 is a wasteful number, since it uses less digits than its factorization.

161435520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28052 (or 28037 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 161435520 is about 12705.7278421978. The cubic root of 161435520 is about 544.5022754372.

Adding to 161435520 its reverse (25534161), we get a palindrome (186969681).

The spelling of 161435520 in words is "one hundred sixty-one million, four hundred thirty-five thousand, five hundred twenty".