161261632 has 56 divisors (see below), whose sum is σ = 371977920. Its totient is φ = 67929600.

The previous prime is 161261629. The next prime is 161261687. The reversal of 161261632 is 236162161.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 161261632.

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, 23382 + ... + 29482.

Almost surely, 2^161261632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161261632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185988960).

161261632 is an abundant number, since it is smaller than the sum of its proper divisors (210716288).

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

161261632 is an equidigital number, since it uses as much as digits as its factorization.

161261632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6179 (or 6169 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 161261632 is about 12698.8831004935. The cubic root of 161261632 is about 544.3067042120.

The spelling of 161261632 in words is "one hundred sixty-one million, two hundred sixty-one thousand, six hundred thirty-two".