161122881 has 4 divisors (see below), whose sum is σ = 214830512. Its totient is φ = 107415252.

The previous prime is 161122879. The next prime is 161122883. The reversal of 161122881 is 188221161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (161122879) and next prime (161122883).

It is not a de Polignac number, because 161122881 - 2¹ = 161122879 is a prime.

It is a super-2 number, since 2×161122881² = 51921165563480322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161122883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26853811 + ... + 26853816.

It is an arithmetic number, because the mean of its divisors is an integer number (53707628).

Almost surely, 2^161122881 is an apocalyptic number.

It is an amenable number.

161122881 is a deficient number, since it is larger than the sum of its proper divisors (53707631).

161122881 is an equidigital number, since it uses as much as digits as its factorization.

161122881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53707630.

The product of its digits is 1536, while the sum is 30.

The square root of 161122881 is about 12693.4188066100. The cubic root of 161122881 is about 544.1505505768.

The spelling of 161122881 in words is "one hundred sixty-one million, one hundred twenty-two thousand, eight hundred eighty-one".