161451472 has 160 divisors (see below), whose sum is σ = 411084800. Its totient is φ = 60963840.

The previous prime is 161451449. The next prime is 161451487. The reversal of 161451472 is 274154161.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2211628 + ... + 2211700.

It is an arithmetic number, because the mean of its divisors is an integer number (2569280).

Almost surely, 2^161451472 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 161451472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205542400).

161451472 is an abundant number, since it is smaller than the sum of its proper divisors (249633328).

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

161451472 is a wasteful number, since it uses less digits than its factorization.

161451472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 126 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 161451472 is about 12706.3555750656. The cubic root of 161451472 is about 544.5202095618.

The spelling of 161451472 in words is "one hundred sixty-one million, four hundred fifty-one thousand, four hundred seventy-two".