31206161 has 8 divisors (see below), whose sum is σ = 36032640. Its totient is φ = 26471808.

The previous prime is 31206157. The next prime is 31206173. The reversal of 31206161 is 16160213.

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

It is a cyclic number.

It is not a de Polignac number, because 31206161 - 2² = 31206157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31206191) 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, 22301 + ... + 23658.

It is an arithmetic number, because the mean of its divisors is an integer number (4504080).

Almost surely, 2^31206161 is an apocalyptic number.

It is an amenable number.

31206161 is a deficient number, since it is larger than the sum of its proper divisors (4826479).

31206161 is an equidigital number, since it uses as much as digits as its factorization.

31206161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46063.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 31206161 is about 5586.2474882518. The cubic root of 31206161 is about 314.8329037345.

Adding to 31206161 its reverse (16160213), we get a palindrome (47366374).

The spelling of 31206161 in words is "thirty-one million, two hundred six thousand, one hundred sixty-one".