161523404 has 18 divisors (see below), whose sum is σ = 328815900. Its totient is φ = 69224232.

The previous prime is 161523391. The next prime is 161523419. The reversal of 161523404 is 404325161.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 411854 + ... + 412245.

It is an arithmetic number, because the mean of its divisors is an integer number (18267550).

Almost surely, 2^161523404 is an apocalyptic number.

161523404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

161523404 is an abundant number, since it is smaller than the sum of its proper divisors (167292496).

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

161523404 is a wasteful number, since it uses less digits than its factorization.

161523404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824117 (or 824108 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 161523404 is about 12709.1858118449. The cubic root of 161523404 is about 544.6010648424.

Adding to 161523404 its reverse (404325161), we get a palindrome (565848565).

The spelling of 161523404 in words is "one hundred sixty-one million, five hundred twenty-three thousand, four hundred four".