31266121 has 4 divisors (see below), whose sum is σ = 31439044. Its totient is φ = 31093200.

The previous prime is 31266113. The next prime is 31266133. The reversal of 31266121 is 12166213.

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 1290496 + 29975625 = 1136^2 + 5475^2 .

It is a cyclic number.

It is not a de Polignac number, because 31266121 - 2³ = 31266113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31266092 and 31266101.

It is not an unprimeable number, because it can be changed into a prime (31266101) 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, 86190 + ... + 86551.

It is an arithmetic number, because the mean of its divisors is an integer number (7859761).

Almost surely, 2^31266121 is an apocalyptic number.

It is an amenable number.

31266121 is a deficient number, since it is larger than the sum of its proper divisors (172923).

31266121 is a wasteful number, since it uses less digits than its factorization.

31266121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172922.

The product of its digits is 432, while the sum is 22.

The square root of 31266121 is about 5591.6116639123. The cubic root of 31266121 is about 315.0344163286.

The spelling of 31266121 in words is "thirty-one million, two hundred sixty-six thousand, one hundred twenty-one".