31170161 has 8 divisors (see below), whose sum is σ = 34435200. Its totient is φ = 27977040.

The previous prime is 31170121. The next prime is 31170173. The reversal of 31170161 is 16107113.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31170161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31170101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17066 + ... + 18803.

It is an arithmetic number, because the mean of its divisors is an integer number (4304400).

Almost surely, 2^31170161 is an apocalyptic number.

It is an amenable number.

31170161 is a deficient number, since it is larger than the sum of its proper divisors (3265039).

31170161 is a wasteful number, since it uses less digits than its factorization.

31170161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35959.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 31170161 is about 5583.0243596101. The cubic root of 31170161 is about 314.7117914783.

Adding to 31170161 its reverse (16107113), we get a palindrome (47277274).

The spelling of 31170161 in words is "thirty-one million, one hundred seventy thousand, one hundred sixty-one".