161801432 has 64 divisors (see below), whose sum is σ = 338664480. Its totient is φ = 71995392.

The previous prime is 161801413. The next prime is 161801443. The reversal of 161801432 is 234108161.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a taxicab number since it can be written as a sum of two cubes in more than one way. Here 161801432 = 212³ + 534³ = 249³ + 527³.

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, 433598 + ... + 433970.

Almost surely, 2^161801432 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 161801432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169332240).

161801432 is an abundant number, since it is smaller than the sum of its proper divisors (176863048).

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

161801432 is a wasteful number, since it uses less digits than its factorization.

161801432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532 (or 528 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 161801432 is about 12720.1191818316. The cubic root of 161801432 is about 544.9133571548.

Adding to 161801432 its reverse (234108161), we get a palindrome (395909593).

The spelling of 161801432 in words is "one hundred sixty-one million, eight hundred one thousand, four hundred thirty-two".