1312123151 has 2 divisors, whose sum is σ = 1312123152. Its totient is φ = 1312123150.

The previous prime is 1312123139. The next prime is 1312123187. The reversal of 1312123151 is 1513212131.

It is a weak prime.

It is an emirp because it is prime and its reverse (1513212131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312123151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312173151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656061575 + 656061576.

It is an arithmetic number, because the mean of its divisors is an integer number (656061576).

Almost surely, 2^1312123151 is an apocalyptic number.

1312123151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312123151 is an equidigital number, since it uses as much as digits as its factorization.

1312123151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 20.

The square root of 1312123151 is about 36223.2404817681. The cubic root of 1312123151 is about 1094.7749865344.

Adding to 1312123151 its reverse (1513212131), we get a palindrome (2825335282).

The spelling of 1312123151 in words is "one billion, three hundred twelve million, one hundred twenty-three thousand, one hundred fifty-one".