161631948 has 48 divisors (see below), whose sum is σ = 395006976. Its totient is φ = 51342720.

The previous prime is 161631929. The next prime is 161631983. The reversal of 161631948 is 849136161.

It is a super-2 number, since 2×161631948² = 52249773228549408, which contains 22 as substring.

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, 85453 + ... + 87323.

It is an arithmetic number, because the mean of its divisors is an integer number (8229312).

Almost surely, 2^161631948 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161631948, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197503488).

161631948 is an abundant number, since it is smaller than the sum of its proper divisors (233375028).

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

161631948 is a wasteful number, since it uses less digits than its factorization.

161631948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214 (or 2212 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 161631948 is about 12713.4553918280. The cubic root of 161631948 is about 544.7230284714.

The spelling of 161631948 in words is "one hundred sixty-one million, six hundred thirty-one thousand, nine hundred forty-eight".