31032121 has 4 divisors (see below), whose sum is σ = 31789044. Its totient is φ = 30275200.

The previous prime is 31032097. The next prime is 31032139. The reversal of 31032121 is 12123013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7645225 + 23386896 = 2765^2 + 4836^2 .

It is a cyclic number.

It is not a de Polignac number, because 31032121 - 2¹¹ = 31030073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31032151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378400 + ... + 378481.

It is an arithmetic number, because the mean of its divisors is an integer number (7947261).

Almost surely, 2^31032121 is an apocalyptic number.

It is an amenable number.

31032121 is a deficient number, since it is larger than the sum of its proper divisors (756923).

31032121 is an equidigital number, since it uses as much as digits as its factorization.

31032121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756922.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31032121 is about 5570.6481669551. The cubic root of 31032121 is about 314.2465270208.

Adding to 31032121 its reverse (12123013), we get a palindrome (43155134).

The spelling of 31032121 in words is "thirty-one million, thirty-two thousand, one hundred twenty-one".