31126121 has 4 divisors (see below), whose sum is σ = 33520452. Its totient is φ = 28731792.

The previous prime is 31126097. The next prime is 31126129. The reversal of 31126121 is 12162113.

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 6574096 + 24552025 = 2564^2 + 4955^2 .

It is a cyclic number.

It is not a de Polignac number, because 31126121 - 2⁶ = 31126057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31126121.

It is not an unprimeable number, because it can be changed into a prime (31126129) 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, 1197146 + ... + 1197171.

It is an arithmetic number, because the mean of its divisors is an integer number (8380113).

Almost surely, 2^31126121 is an apocalyptic number.

It is an amenable number.

31126121 is a deficient number, since it is larger than the sum of its proper divisors (2394331).

31126121 is a wasteful number, since it uses less digits than its factorization.

31126121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2394330.

The product of its digits is 72, while the sum is 17.

The square root of 31126121 is about 5579.0788666231. The cubic root of 31126121 is about 314.5635039336.

Adding to 31126121 its reverse (12162113), we get a palindrome (43288234).

The spelling of 31126121 in words is "thirty-one million, one hundred twenty-six thousand, one hundred twenty-one".