161227771 has 4 divisors (see below), whose sum is σ = 161438200. Its totient is φ = 161017344.

The previous prime is 161227751. The next prime is 161227777. The reversal of 161227771 is 177722161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 177722161 = 1217 ⋅146033.

It is a cyclic number.

It is not a de Polignac number, because 161227771 - 2¹¹ = 161225723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161227777) 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, 104061 + ... + 105598.

It is an arithmetic number, because the mean of its divisors is an integer number (40359550).

Almost surely, 2^161227771 is an apocalyptic number.

161227771 is a deficient number, since it is larger than the sum of its proper divisors (210429).

161227771 is an equidigital number, since it uses as much as digits as its factorization.

161227771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210428.

The product of its digits is 8232, while the sum is 34.

The square root of 161227771 is about 12697.5498030132. The cubic root of 161227771 is about 544.2686045119.

The spelling of 161227771 in words is "one hundred sixty-one million, two hundred twenty-seven thousand, seven hundred seventy-one".