31211230 has 16 divisors (see below), whose sum is σ = 58623264. Its totient is φ = 11941600.

The previous prime is 31211227. The next prime is 31211231. The reversal of 31211230 is 3211213.

It is a super-2 number, since 2×31211230² = 1948281756225800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31211230.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31211231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67621 + ... + 68080.

It is an arithmetic number, because the mean of its divisors is an integer number (3663954).

Almost surely, 2^31211230 is an apocalyptic number.

31211230 is a deficient number, since it is larger than the sum of its proper divisors (27412034).

31211230 is a wasteful number, since it uses less digits than its factorization.

31211230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135731.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31211230 is about 5586.7011733222. The cubic root of 31211230 is about 314.8499495308.

Adding to 31211230 its reverse (3211213), we get a palindrome (34422443).

The spelling of 31211230 in words is "thirty-one million, two hundred eleven thousand, two hundred thirty".