161122260 has 192 divisors, whose sum is σ = 533433600. Its totient is φ = 35954688.

The previous prime is 161122259. The next prime is 161122319. The reversal of 161122260 is 62221161.

161122260 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 384331 + ... + 384749.

It is an arithmetic number, because the mean of its divisors is an integer number (2778300).

Almost surely, 2^161122260 is an apocalyptic number.

161122260 is a gapful number since it is divisible by the number (10) 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 161122260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266716800).

161122260 is an abundant number, since it is smaller than the sum of its proper divisors (372311340).

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

161122260 is a wasteful number, since it uses less digits than its factorization.

161122260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 161122260 is about 12693.3943450915. The cubic root of 161122260 is about 544.1498514874.

It can be divided in two parts, 1611 and 22260, that added together give a triangular number (23871 = T₂₁₈).

The spelling of 161122260 in words is "one hundred sixty-one million, one hundred twenty-two thousand, two hundred sixty".