31534521 has 4 divisors (see below), whose sum is σ = 42046032. Its totient is φ = 21023012.

The previous prime is 31534501. The next prime is 31534543. The reversal of 31534521 is 12543513.

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: 12543513 = 3 ⋅4181171.

It is a cyclic number.

It is not a de Polignac number, because 31534521 - 2⁶ = 31534457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31534491 and 31534500.

It is not an unprimeable number, because it can be changed into a prime (31534501) 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, 5255751 + ... + 5255756.

It is an arithmetic number, because the mean of its divisors is an integer number (10511508).

Almost surely, 2^31534521 is an apocalyptic number.

It is an amenable number.

31534521 is a deficient number, since it is larger than the sum of its proper divisors (10511511).

31534521 is a wasteful number, since it uses less digits than its factorization.

31534521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10511510.

The product of its digits is 1800, while the sum is 24.

The square root of 31534521 is about 5615.5606131534. The cubic root of 31534521 is about 315.9333065734.

The spelling of 31534521 in words is "thirty-one million, five hundred thirty-four thousand, five hundred twenty-one".