161261056 has 120 divisors (see below), whose sum is σ = 375522840. Its totient is φ = 68935680.

The previous prime is 161261029. The next prime is 161261063. The reversal of 161261056 is 650162161.

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, 1177020 + ... + 1177156.

It is an arithmetic number, because the mean of its divisors is an integer number (3129357).

Almost surely, 2^161261056 is an apocalyptic number.

161261056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161261056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187761420).

161261056 is an abundant number, since it is smaller than the sum of its proper divisors (214261784).

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

161261056 is a wasteful number, since it uses less digits than its factorization.

161261056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 161261056 is about 12698.8604213134. The cubic root of 161261056 is about 544.3060561532.

The spelling of 161261056 in words is "one hundred sixty-one million, two hundred sixty-one thousand, fifty-six".