161222041 has 4 divisors (see below), whose sum is σ = 166422784. Its totient is φ = 156021300.

The previous prime is 161222029. The next prime is 161222053. The reversal of 161222041 is 140222161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 140222161 = 2029 ⋅69109.

It is an interprime number because it is at equal distance from previous prime (161222029) and next prime (161222053).

It is a cyclic number.

It is not a de Polignac number, because 161222041 - 2²³ = 152833433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161222081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2600325 + ... + 2600386.

It is an arithmetic number, because the mean of its divisors is an integer number (41605696).

Almost surely, 2^161222041 is an apocalyptic number.

It is an amenable number.

161222041 is a deficient number, since it is larger than the sum of its proper divisors (5200743).

161222041 is an equidigital number, since it uses as much as digits as its factorization.

161222041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5200742.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 161222041 is about 12697.3241669259. The cubic root of 161222041 is about 544.2621567061.

It can be divided in two parts, 1612 and 22041, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 161222041 in words is "one hundred sixty-one million, two hundred twenty-two thousand, forty-one".