161591006 has 8 divisors (see below), whose sum is σ = 242540904. Its totient is φ = 80744040.

The previous prime is 161590973. The next prime is 161591021. The reversal of 161591006 is 600195161.

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

It is a super-2 number, since 2×161591006² = 52223306440184072, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161591006.

It is a congruent 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, 21680 + ... + 28163.

It is an arithmetic number, because the mean of its divisors is an integer number (30317613).

Almost surely, 2^161591006 is an apocalyptic number.

161591006 is a deficient number, since it is larger than the sum of its proper divisors (80949898).

161591006 is a wasteful number, since it uses less digits than its factorization.

161591006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51466.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 161591006 is about 12711.8451060418. The cubic root of 161591006 is about 544.6770311013.

The spelling of 161591006 in words is "one hundred sixty-one million, five hundred ninety-one thousand, six".