161749478 has 32 divisors (see below), whose sum is σ = 277385472. Its totient is φ = 70021600.

The previous prime is 161749453. The next prime is 161749507. The reversal of 161749478 is 874947161.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 147713 + ... + 148803.

It is an arithmetic number, because the mean of its divisors is an integer number (8668296).

Almost surely, 2^161749478 is an apocalyptic number.

161749478 is a deficient number, since it is larger than the sum of its proper divisors (115635994).

161749478 is a wasteful number, since it uses less digits than its factorization.

161749478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420.

The product of its digits is 338688, while the sum is 47.

The square root of 161749478 is about 12718.0768200228. The cubic root of 161749478 is about 544.8550275120.

It can be divided in two parts, 16174 and 9478, that added together give a palindrome (25652).

The spelling of 161749478 in words is "one hundred sixty-one million, seven hundred forty-nine thousand, four hundred seventy-eight".