31220230 has 32 divisors (see below), whose sum is σ = 60766560. Its totient is φ = 11508480.

The previous prime is 31220219. The next prime is 31220239. The reversal of 31220230 is 3202213.

It is a happy number.

It is a super-3 number, since 3×31220230³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 31220230.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4810 + ... + 9250.

It is an arithmetic number, because the mean of its divisors is an integer number (1898955).

Almost surely, 2^31220230 is an apocalyptic number.

31220230 is a deficient number, since it is larger than the sum of its proper divisors (29546330).

31220230 is a wasteful number, since it uses less digits than its factorization.

31220230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4504.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 31220230 is about 5587.5065995487. The cubic root of 31220230 is about 314.8802097632.

Adding to 31220230 its reverse (3202213), we get a palindrome (34422443).

The spelling of 31220230 in words is "thirty-one million, two hundred twenty thousand, two hundred thirty".