161020071 has 6 divisors (see below), whose sum is σ = 232584560. Its totient is φ = 107346708.

The previous prime is 161020061. The next prime is 161020081. The reversal of 161020071 is 170020161.

It is an interprime number because it is at equal distance from previous prime (161020061) and next prime (161020081).

It is not a de Polignac number, because 161020071 - 2¹¹ = 161018023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161020001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8945551 + ... + 8945568.

Almost surely, 2^161020071 is an apocalyptic number.

161020071 is a deficient number, since it is larger than the sum of its proper divisors (71564489).

161020071 is a wasteful number, since it uses less digits than its factorization.

161020071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17891125 (or 17891122 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 161020071 is about 12689.3684239997. The cubic root of 161020071 is about 544.0347879552.

The spelling of 161020071 in words is "one hundred sixty-one million, twenty thousand, seventy-one".