1312123011 has 8 divisors (see below), whose sum is σ = 1749913344. Its totient is φ = 874540680.

The previous prime is 1312122983. The next prime is 1312123061. The reversal of 1312123011 is 1103212131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1312123011 is a prime.

It is a super-2 number, since 2×1312123011² = 3443333591991412242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1312123061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36631 + ... + 62976.

It is an arithmetic number, because the mean of its divisors is an integer number (218739168).

Almost surely, 2^1312123011 is an apocalyptic number.

1312123011 is a deficient number, since it is larger than the sum of its proper divisors (437790333).

1312123011 is an equidigital number, since it uses as much as digits as its factorization.

1312123011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104001.

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

The square root of 1312123011 is about 36223.2385493070. The cubic root of 1312123011 is about 1094.7749475979.

Adding to 1312123011 its reverse (1103212131), we get a palindrome (2415335142).

The spelling of 1312123011 in words is "one billion, three hundred twelve million, one hundred twenty-three thousand, eleven".