161523906 has 8 divisors (see below), whose sum is σ = 323047824. Its totient is φ = 53841300.

The previous prime is 161523889. The next prime is 161523931. The reversal of 161523906 is 609325161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

161523906 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13460320 + ... + 13460331.

It is an arithmetic number, because the mean of its divisors is an integer number (40380978).

Almost surely, 2^161523906 is an apocalyptic number.

161523906 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

161523906 is a wasteful number, since it uses less digits than its factorization.

161523906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26920656.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 161523906 is about 12709.2055613244. The cubic root of 161523906 is about 544.6016290320.

The spelling of 161523906 in words is "one hundred sixty-one million, five hundred twenty-three thousand, nine hundred six".