161271380 has 12 divisors (see below), whose sum is σ = 338669940. Its totient is φ = 64508544.

The previous prime is 161271353. The next prime is 161271431. The reversal of 161271380 is 83172161.

161271380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 115004176 + 46267204 = 10724^2 + 6802^2 .

It is a super-3 number, since 3×161271380³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4031765 + ... + 4031804.

It is an arithmetic number, because the mean of its divisors is an integer number (28222495).

Almost surely, 2^161271380 is an apocalyptic number.

161271380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161271380 is an abundant number, since it is smaller than the sum of its proper divisors (177398560).

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

161271380 is a wasteful number, since it uses less digits than its factorization.

161271380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8063578 (or 8063576 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 161271380 is about 12699.2669079754. The cubic root of 161271380 is about 544.3176714722.

The spelling of 161271380 in words is "one hundred sixty-one million, two hundred seventy-one thousand, three hundred eighty".