161122478 has 16 divisors (see below), whose sum is σ = 264757680. Its totient is φ = 72931200.

The previous prime is 161122477. The next prime is 161122483. The reversal of 161122478 is 874221161.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161122477) 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 7 ways as a sum of consecutive naturals, for example, 9893 + ... + 20496.

It is an arithmetic number, because the mean of its divisors is an integer number (16547355).

Almost surely, 2^161122478 is an apocalyptic number.

161122478 is a deficient number, since it is larger than the sum of its proper divisors (103635202).

161122478 is a wasteful number, since it uses less digits than its factorization.

161122478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30643.

The product of its digits is 5376, while the sum is 32.

The square root of 161122478 is about 12693.4029322322. The cubic root of 161122478 is about 544.1500969006.

The spelling of 161122478 in words is "one hundred sixty-one million, one hundred twenty-two thousand, four hundred seventy-eight".