161606771 has 4 divisors (see below), whose sum is σ = 165365112. Its totient is φ = 157848432.

The previous prime is 161606729. The next prime is 161606791. The reversal of 161606771 is 177606161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161606771 - 2¹⁰ = 161605747 is a prime.

It is a super-2 number, since 2×161606771² = 52233496866092882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161606791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1879106 + ... + 1879191.

It is an arithmetic number, because the mean of its divisors is an integer number (41341278).

Almost surely, 2^161606771 is an apocalyptic number.

161606771 is a deficient number, since it is larger than the sum of its proper divisors (3758341).

161606771 is an equidigital number, since it uses as much as digits as its factorization.

161606771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3758340.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 161606771 is about 12712.4651818599. The cubic root of 161606771 is about 544.6947436263.

The spelling of 161606771 in words is "one hundred sixty-one million, six hundred six thousand, seven hundred seventy-one".