161509632 has 36 divisors (see below), whose sum is σ = 429853200. Its totient is φ = 53836288.

The previous prime is 161509631. The next prime is 161509643. The reversal of 161509632 is 236905161.

It is a happy number.

It is a super-2 number, since 2×161509632² = 52170722457550848, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161509593 and 161509602.

It is not an unprimeable number, because it can be changed into a prime (161509631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104382 + ... + 105917.

Almost surely, 2^161509632 is an apocalyptic number.

161509632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161509632 is an abundant number, since it is smaller than the sum of its proper divisors (268343568).

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

161509632 is an equidigital number, since it uses as much as digits as its factorization.

161509632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210318 (or 210304 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 161509632 is about 12708.6439874599. The cubic root of 161509632 is about 544.5855862619.

The spelling of 161509632 in words is "one hundred sixty-one million, five hundred nine thousand, six hundred thirty-two".