1311220132 has 24 divisors (see below), whose sum is σ = 2469451320. Its totient is φ = 606927360.

The previous prime is 1311220129. The next prime is 1311220151. The reversal of 1311220132 is 2310221131.

It can be written as a sum of positive squares in 4 ways, for example, as 196728676 + 1114491456 = 14026^2 + 33384^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153907 + ... + 162202.

It is an arithmetic number, because the mean of its divisors is an integer number (102893805).

Almost surely, 2^1311220132 is an apocalyptic number.

It is an amenable number.

1311220132 is a deficient number, since it is larger than the sum of its proper divisors (1158231188).

1311220132 is a wasteful number, since it uses less digits than its factorization.

1311220132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316191 (or 316189 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1311220132 is about 36210.7737006543. The cubic root of 1311220132 is about 1094.5237831092.

Adding to 1311220132 its reverse (2310221131), we get a palindrome (3621441263).

Subtracting 1311220132 from its reverse (2310221131), we obtain a palindrome (999000999).

The spelling of 1311220132 in words is "one billion, three hundred eleven million, two hundred twenty thousand, one hundred thirty-two".