1312012511 has 4 divisors (see below), whose sum is σ = 1313502624. Its totient is φ = 1310522400.

The previous prime is 1312012477. The next prime is 1312012543. The reversal of 1312012511 is 1152102131.

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

It is a cyclic number.

It is not a de Polignac number, because 1312012511 - 2⁶ = 1312012447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1312012511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312012561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743735 + ... + 745496.

It is an arithmetic number, because the mean of its divisors is an integer number (328375656).

Almost surely, 2^1312012511 is an apocalyptic number.

1312012511 is a deficient number, since it is larger than the sum of its proper divisors (1490113).

1312012511 is an equidigital number, since it uses as much as digits as its factorization.

1312012511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490112.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1312012511 is about 36221.7132532408. The cubic root of 1312012511 is about 1094.7442147000.

Adding to 1312012511 its reverse (1152102131), we get a palindrome (2464114642).

The spelling of 1312012511 in words is "one billion, three hundred twelve million, twelve thousand, five hundred eleven".