161231008 has 24 divisors (see below), whose sum is σ = 318941280. Its totient is φ = 80230080.

The previous prime is 161230987. The next prime is 161231051. The reversal of 161231008 is 800132161.

It is a self number, because there is not a number n which added to its sum of digits gives 161231008.

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, 5188 + ... + 18691.

It is an arithmetic number, because the mean of its divisors is an integer number (13289220).

Almost surely, 2^161231008 is an apocalyptic number.

It is an amenable number.

161231008 is a deficient number, since it is larger than the sum of its proper divisors (157710272).

161231008 is a wasteful number, since it uses less digits than its factorization.

161231008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24100 (or 24092 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 161231008 is about 12697.6772679101. The cubic root of 161231008 is about 544.2722469482.

Adding to 161231008 its reverse (800132161), we get a palindrome (961363169).

The spelling of 161231008 in words is "one hundred sixty-one million, two hundred thirty-one thousand, eight".