724432161 has 4 divisors (see below), whose sum is σ = 965909552. Its totient is φ = 482954772.

The previous prime is 724432123. The next prime is 724432193. The reversal of 724432161 is 161234427.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 724432161 - 2¹⁴ = 724415777 is a prime.

It is a super-2 number, since 2×724432161² = 1049603911782259842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (724432561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120738691 + ... + 120738696.

It is an arithmetic number, because the mean of its divisors is an integer number (241477388).

Almost surely, 2^724432161 is an apocalyptic number.

It is an amenable number.

724432161 is a deficient number, since it is larger than the sum of its proper divisors (241477391).

724432161 is a wasteful number, since it uses less digits than its factorization.

724432161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241477390.

The product of its digits is 8064, while the sum is 30.

The square root of 724432161 is about 26915.2774646668. The cubic root of 724432161 is about 898.1162909930.

Adding to 724432161 its reverse (161234427), we get a palindrome (885666588).

The spelling of 724432161 in words is "seven hundred twenty-four million, four hundred thirty-two thousand, one hundred sixty-one".