1311220101 has 16 divisors (see below), whose sum is σ = 1769644800. Its totient is φ = 863505408.

The previous prime is 1311220073. The next prime is 1311220103. The reversal of 1311220101 is 1010221131.

It is not a de Polignac number, because 1311220101 - 2⁵ = 1311220069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311220103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161620 + ... + 169538.

It is an arithmetic number, because the mean of its divisors is an integer number (110602800).

Almost surely, 2^1311220101 is an apocalyptic number.

It is an amenable number.

1311220101 is a deficient number, since it is larger than the sum of its proper divisors (458424699).

1311220101 is an equidigital number, since it uses as much as digits as its factorization.

1311220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8588.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1311220101 is about 36210.7732726049. The cubic root of 1311220101 is about 1094.5237744835.

Adding to 1311220101 its reverse (1010221131), we get a palindrome (2321441232).

The spelling of 1311220101 in words is "one billion, three hundred eleven million, two hundred twenty thousand, one hundred one".