161388071 has 12 divisors (see below), whose sum is σ = 183958920. Its totient is φ = 141130080.

The previous prime is 161388049. The next prime is 161388169. The reversal of 161388071 is 170883161.

It is not a de Polignac number, because 161388071 - 2¹⁸ = 161125927 is a prime.

It is a super-2 number, since 2×161388071² = 52092218922202082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161387071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21920 + ... + 28341.

It is an arithmetic number, because the mean of its divisors is an integer number (15329910).

Almost surely, 2^161388071 is an apocalyptic number.

161388071 is a deficient number, since it is larger than the sum of its proper divisors (22570849).

161388071 is a wasteful number, since it uses less digits than its factorization.

161388071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50306 (or 50293 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 161388071 is about 12703.8604762489. The cubic root of 161388071 is about 544.4489236508.

It can be divided in two parts, 161 and 388071, that multiplied together give a triangular number (62479431 = T₁₁₁₇₈).

The spelling of 161388071 in words is "one hundred sixty-one million, three hundred eighty-eight thousand, seventy-one".