1211131310 has 16 divisors (see below), whose sum is σ = 2185078896. Its totient is φ = 483331968.

The previous prime is 1211131301. The next prime is 1211131319. The reversal of 1211131310 is 131311121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1211131301) and next prime (1211131319).

It is a super-2 number, since 2×1211131310² = 2933678100124632200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211131319) 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 7 ways as a sum of consecutive naturals, for example, 135524 + ... + 144183.

It is an arithmetic number, because the mean of its divisors is an integer number (136567431).

Almost surely, 2^1211131310 is an apocalyptic number.

1211131310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211131310 is a deficient number, since it is larger than the sum of its proper divisors (973947586).

1211131310 is a wasteful number, since it uses less digits than its factorization.

1211131310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280147.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1211131310 is about 34801.3119005592. The cubic root of 1211131310 is about 1065.9342342742.

Adding to 1211131310 its reverse (131311121), we get a palindrome (1342442431).

The spelling of 1211131310 in words is "one billion, two hundred eleven million, one hundred thirty-one thousand, three hundred ten".