161505071 has 16 divisors (see below), whose sum is σ = 205191168. Its totient is φ = 123660000.

The previous prime is 161505067. The next prime is 161505079. The reversal of 161505071 is 170505161.

It is a cyclic number.

It is not a de Polignac number, because 161505071 - 2² = 161505067 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161505071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161505079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25805 + ... + 31446.

It is an arithmetic number, because the mean of its divisors is an integer number (12824448).

Almost surely, 2^161505071 is an apocalyptic number.

161505071 is a deficient number, since it is larger than the sum of its proper divisors (43686097).

161505071 is a wasteful number, since it uses less digits than its factorization.

161505071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57302.

The product of its (nonzero) digits is 1050, while the sum is 26.

The square root of 161505071 is about 12708.4645413992. The cubic root of 161505071 is about 544.5804598840.

The spelling of 161505071 in words is "one hundred sixty-one million, five hundred five thousand, seventy-one".