161504434 has 16 divisors (see below), whose sum is σ = 298162368. Its totient is φ = 63891792.

The previous prime is 161504423. The next prime is 161504449. The reversal of 161504434 is 434405161.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 443512 + ... + 443875.

It is an arithmetic number, because the mean of its divisors is an integer number (18635148).

Almost surely, 2^161504434 is an apocalyptic number.

161504434 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161504434 is a deficient number, since it is larger than the sum of its proper divisors (136657934).

161504434 is a wasteful number, since it uses less digits than its factorization.

161504434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887409.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 161504434 is about 12708.4394793381. The cubic root of 161504434 is about 544.5797439143.

Adding to 161504434 its reverse (434405161), we get a palindrome (595909595).

The spelling of 161504434 in words is "one hundred sixty-one million, five hundred four thousand, four hundred thirty-four".