161278701 has 16 divisors (see below), whose sum is σ = 218972160. Its totient is φ = 105565040.

The previous prime is 161278679. The next prime is 161278703. The reversal of 161278701 is 107872161.

It is a cyclic number.

It is not a de Polignac number, because 161278701 - 2¹¹ = 161276653 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161278703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54580 + ... + 57458.

It is an arithmetic number, because the mean of its divisors is an integer number (13685760).

Almost surely, 2^161278701 is an apocalyptic number.

It is an amenable number.

161278701 is a deficient number, since it is larger than the sum of its proper divisors (57693459).

161278701 is a wasteful number, since it uses less digits than its factorization.

161278701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216.

The product of its (nonzero) digits is 4704, while the sum is 33.

The square root of 161278701 is about 12699.5551496893. Note that the first 3 decimals coincide. The cubic root of 161278701 is about 544.3259078776.

The spelling of 161278701 in words is "one hundred sixty-one million, two hundred seventy-eight thousand, seven hundred one".