161229771 has 48 divisors (see below), whose sum is σ = 250504800. Its totient is φ = 103576320.

The previous prime is 161229727. The next prime is 161229779. The reversal of 161229771 is 177922161.

It is a happy number.

It is not a de Polignac number, because 161229771 - 2⁶ = 161229707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161229779) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1082005 + ... + 1082153.

It is an arithmetic number, because the mean of its divisors is an integer number (5218850).

Almost surely, 2^161229771 is an apocalyptic number.

161229771 is a deficient number, since it is larger than the sum of its proper divisors (89275029).

161229771 is an equidigital number, since it uses as much as digits as its factorization.

161229771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 286 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 161229771 is about 12697.6285581206. The cubic root of 161229771 is about 544.2708550189.

The spelling of 161229771 in words is "one hundred sixty-one million, two hundred twenty-nine thousand, seven hundred seventy-one".