1211201313 has 16 divisors (see below), whose sum is σ = 1846142976. Its totient is φ = 691926480.

The previous prime is 1211201309. The next prime is 1211201323. The reversal of 1211201313 is 3131021121.

It is a happy number.

It is not a de Polignac number, because 1211201313 - 2² = 1211201309 is a prime.

It is a super-2 number, since 2×1211201313² = 2934017241225847938, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211201292 and 1211201301.

It is not an unprimeable number, because it can be changed into a prime (1211201323) 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, 117768 + ... + 127638.

It is an arithmetic number, because the mean of its divisors is an integer number (115383936).

Almost surely, 2^1211201313 is an apocalyptic number.

It is an amenable number.

1211201313 is a deficient number, since it is larger than the sum of its proper divisors (634941663).

1211201313 is an equidigital number, since it uses as much as digits as its factorization.

1211201313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15724.

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

The square root of 1211201313 is about 34802.3176383413. The cubic root of 1211201313 is about 1065.9547707637.

Adding to 1211201313 its reverse (3131021121), we get a palindrome (4342222434).

The spelling of 1211201313 in words is "one billion, two hundred eleven million, two hundred one thousand, three hundred thirteen".