31530212 has 24 divisors (see below), whose sum is σ = 63645120. Its totient is φ = 13387680.

The previous prime is 31530211. The next prime is 31530269. The reversal of 31530212 is 21203513.

It is not an unprimeable number, because it can be changed into a prime (31530211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2114 + ... + 8217.

It is an arithmetic number, because the mean of its divisors is an integer number (2651880).

Almost surely, 2^31530212 is an apocalyptic number.

It is an amenable number.

31530212 is an abundant number, since it is smaller than the sum of its proper divisors (32114908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31530212 is a wasteful number, since it uses less digits than its factorization.

31530212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10451 (or 10449 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 31530212 is about 5615.1769339888. The cubic root of 31530212 is about 315.9189157980.

Adding to 31530212 its reverse (21203513), we get a palindrome (52733725).

The spelling of 31530212 in words is "thirty-one million, five hundred thirty thousand, two hundred twelve".