1312321011 has 16 divisors (see below), whose sum is σ = 1781740800. Its totient is φ = 858929888.

The previous prime is 1312320979. The next prime is 1312321019. The reversal of 1312321011 is 1101232131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1312321011 - 2⁵ = 1312320979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1312321019) 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, 144085 + ... + 152921.

It is an arithmetic number, because the mean of its divisors is an integer number (111358800).

Almost surely, 2^1312321011 is an apocalyptic number.

1312321011 is a deficient number, since it is larger than the sum of its proper divisors (469419789).

1312321011 is an equidigital number, since it uses as much as digits as its factorization.

1312321011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9738.

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

The square root of 1312321011 is about 36225.9714983601. The cubic root of 1312321011 is about 1094.8300121855.

Adding to 1312321011 its reverse (1101232131), we get a palindrome (2413553142).

The spelling of 1312321011 in words is "one billion, three hundred twelve million, three hundred twenty-one thousand, eleven".