31336121 has 4 divisors (see below), whose sum is σ = 32064912. Its totient is φ = 30607332.

The previous prime is 31336093. The next prime is 31336157. The reversal of 31336121 is 12163313.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12163313 = 17 ⋅715489.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31336121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31336093 and 31336102.

It is not an unprimeable number, because it can be changed into a prime (31336181) 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, 364331 + ... + 364416.

It is an arithmetic number, because the mean of its divisors is an integer number (8016228).

Almost surely, 2^31336121 is an apocalyptic number.

It is an amenable number.

31336121 is a deficient number, since it is larger than the sum of its proper divisors (728791).

31336121 is an equidigital number, since it uses as much as digits as its factorization.

31336121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728790.

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

The square root of 31336121 is about 5597.8675404122. The cubic root of 31336121 is about 315.2693455061.

Adding to 31336121 its reverse (12163313), we get a palindrome (43499434).

The spelling of 31336121 in words is "thirty-one million, three hundred thirty-six thousand, one hundred twenty-one".