125315111321 has 2 divisors, whose sum is σ = 125315111322. Its totient is φ = 125315111320.

The previous prime is 125315111239. The next prime is 125315111347. The reversal of 125315111321 is 123111513521.

It is a happy number.

It is an a-pointer prime, because the next prime (125315111347) can be obtained adding 125315111321 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97304068096 + 28011043225 = 311936^2 + 167365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125315111321 is a prime.

It is not a weakly prime, because it can be changed into another prime (125315111521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62657555660 + 62657555661.

It is an arithmetic number, because the mean of its divisors is an integer number (62657555661).

Almost surely, 2^125315111321 is an apocalyptic number.

It is an amenable number.

125315111321 is a deficient number, since it is larger than the sum of its proper divisors (1).

125315111321 is an equidigital number, since it uses as much as digits as its factorization.

125315111321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 26.

Adding to 125315111321 its reverse (123111513521), we get a palindrome (248426624842).

The spelling of 125315111321 in words is "one hundred twenty-five billion, three hundred fifteen million, one hundred eleven thousand, three hundred twenty-one".