161271330 has 32 divisors (see below), whose sum is σ = 422238528. Its totient is φ = 39096000.

The previous prime is 161271329. The next prime is 161271347. The reversal of 161271330 is 33172161.

It is a self number, because there is not a number n which added to its sum of digits gives 161271330.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244021 + ... + 244680.

It is an arithmetic number, because the mean of its divisors is an integer number (13194954).

Almost surely, 2^161271330 is an apocalyptic number.

161271330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161271330 is an abundant number, since it is smaller than the sum of its proper divisors (260967198).

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

161271330 is a wasteful number, since it uses less digits than its factorization.

161271330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488722.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 161271330 is about 12699.2649393577. The cubic root of 161271330 is about 544.3176152194.

The spelling of 161271330 in words is "one hundred sixty-one million, two hundred seventy-one thousand, three hundred thirty".