161681270 has 32 divisors (see below), whose sum is σ = 297921888. Its totient is φ = 63152128.

The previous prime is 161681257. The next prime is 161681291. The reversal of 161681270 is 72186161.

It is a happy number.

It is a super-2 number, since 2×161681270² = 52281666137625800, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135617 + ... + 136803.

It is an arithmetic number, because the mean of its divisors is an integer number (9310059).

Almost surely, 2^161681270 is an apocalyptic number.

161681270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161681270 is a deficient number, since it is larger than the sum of its proper divisors (136240618).

161681270 is a wasteful number, since it uses less digits than its factorization.

161681270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 161681270 is about 12715.3949997631. The cubic root of 161681270 is about 544.7784302596.

The spelling of 161681270 in words is "one hundred sixty-one million, six hundred eighty-one thousand, two hundred seventy".