31233161 has 4 divisors (see below), whose sum is σ = 31458000. Its totient is φ = 31008324.

The previous prime is 31233121. The next prime is 31233221. The reversal of 31233161 is 16133213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31233161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31233101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112211 + ... + 112488.

It is an arithmetic number, because the mean of its divisors is an integer number (7864500).

Almost surely, 2^31233161 is an apocalyptic number.

It is an amenable number.

31233161 is a deficient number, since it is larger than the sum of its proper divisors (224839).

31233161 is a wasteful number, since it uses less digits than its factorization.

31233161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224838.

The product of its digits is 324, while the sum is 20.

The square root of 31233161 is about 5588.6636148546. The cubic root of 31233161 is about 314.9236768140.

Adding to 31233161 its reverse (16133213), we get a palindrome (47366374).

The spelling of 31233161 in words is "thirty-one million, two hundred thirty-three thousand, one hundred sixty-one".