31220530 has 32 divisors (see below), whose sum is σ = 63426240. Its totient is φ = 10960320.

The previous prime is 31220521. The next prime is 31220561. The reversal of 31220530 is 3502213.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1704 + ... + 8083.

It is an arithmetic number, because the mean of its divisors is an integer number (1982070).

Almost surely, 2^31220530 is an apocalyptic number.

31220530 is an abundant number, since it is smaller than the sum of its proper divisors (32205710).

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

31220530 is a wasteful number, since it uses less digits than its factorization.

31220530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9834.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 31220530 is about 5587.5334450901. The cubic root of 31220530 is about 314.8812183374.

Adding to 31220530 its reverse (3502213), we get a palindrome (34722743).

The spelling of 31220530 in words is "thirty-one million, two hundred twenty thousand, five hundred thirty".