1311220102 has 4 divisors (see below), whose sum is σ = 1966830156. Its totient is φ = 655610050.

The previous prime is 1311220073. The next prime is 1311220103. The reversal of 1311220102 is 2010221131.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 327805024 + ... + 327805027.

It is an arithmetic number, because the mean of its divisors is an integer number (491707539).

Almost surely, 2^1311220102 is an apocalyptic number.

1311220102 is a deficient number, since it is larger than the sum of its proper divisors (655610054).

1311220102 is an equidigital number, since it uses as much as digits as its factorization.

1311220102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655610053.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1311220102 is about 36210.7732864130. The cubic root of 1311220102 is about 1094.5237747618.

Adding to 1311220102 its reverse (2010221131), we get a palindrome (3321441233).

The spelling of 1311220102 in words is "one billion, three hundred eleven million, two hundred twenty thousand, one hundred two".