31214521 has 4 divisors (see below), whose sum is σ = 33615652. Its totient is φ = 28813392.

The previous prime is 31214507. The next prime is 31214531. The reversal of 31214521 is 12541213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12541213 = 109 ⋅115057.

It can be written as a sum of positive squares in 2 ways, for example, as 17338896 + 13875625 = 4164^2 + 3725^2 .

It is a cyclic number.

It is not a de Polignac number, because 31214521 - 2¹¹ = 31212473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31214501) 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, 1200546 + ... + 1200571.

It is an arithmetic number, because the mean of its divisors is an integer number (8403913).

Almost surely, 2^31214521 is an apocalyptic number.

It is an amenable number.

31214521 is a deficient number, since it is larger than the sum of its proper divisors (2401131).

31214521 is a wasteful number, since it uses less digits than its factorization.

31214521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401130.

The product of its digits is 240, while the sum is 19.

The square root of 31214521 is about 5586.9957043119. The cubic root of 31214521 is about 314.8610153637.

Adding to 31214521 its reverse (12541213), we get a palindrome (43755734).

The spelling of 31214521 in words is "thirty-one million, two hundred fourteen thousand, five hundred twenty-one".