1211131230 has 32 divisors (see below), whose sum is σ = 2911918464. Its totient is φ = 322390176.

The previous prime is 1211131223. The next prime is 1211131237. The reversal of 1211131230 is 321311121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1211131223) and next prime (1211131237).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211131237) by changing a digit.

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, 18964 + ... + 52743.

It is an arithmetic number, because the mean of its divisors is an integer number (90997452).

Almost surely, 2^1211131230 is an apocalyptic number.

1211131230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211131230 is an abundant number, since it is smaller than the sum of its proper divisors (1700787234).

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

1211131230 is a wasteful number, since it uses less digits than its factorization.

1211131230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72280.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1211131230 is about 34801.3107511772. The cubic root of 1211131230 is about 1065.9342108044.

Adding to 1211131230 its reverse (321311121), we get a palindrome (1532442351).

The spelling of 1211131230 in words is "one billion, two hundred eleven million, one hundred thirty-one thousand, two hundred thirty".