161632254 has 64 divisors (see below), whose sum is σ = 385482240. Its totient is φ = 44204160.

The previous prime is 161632241. The next prime is 161632279. The reversal of 161632254 is 452236161.

It is a super-2 number, since 2×161632254² = 52249971066241032, which contains 22 as substring.

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 (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159052 + ... + 160064.

It is an arithmetic number, because the mean of its divisors is an integer number (6023160).

Almost surely, 2^161632254 is an apocalyptic number.

161632254 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161632254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192741120).

161632254 is an abundant number, since it is smaller than the sum of its proper divisors (223849986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161632254 is a wasteful number, since it uses less digits than its factorization.

161632254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185.

The product of its digits is 8640, while the sum is 30.

The square root of 161632254 is about 12713.4674263161. The cubic root of 161632254 is about 544.7233722259.

The spelling of 161632254 in words is "one hundred sixty-one million, six hundred thirty-two thousand, two hundred fifty-four".