1326120251 has 2 divisors, whose sum is σ = 1326120252. Its totient is φ = 1326120250.

The previous prime is 1326120239. The next prime is 1326120259. The reversal of 1326120251 is 1520216231.

It is a strong prime.

It is an emirp because it is prime and its reverse (1520216231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1326120251 is a prime.

It is a super-2 number, since 2×1326120251² = 3517189840224606002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1326120259) 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 as a sum of consecutive naturals, namely, 663060125 + 663060126.

It is an arithmetic number, because the mean of its divisors is an integer number (663060126).

Almost surely, 2^1326120251 is an apocalyptic number.

1326120251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1326120251 is an equidigital number, since it uses as much as digits as its factorization.

1326120251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1326120251 is about 36415.9340261924. The cubic root of 1326120251 is about 1098.6540703582.

Adding to 1326120251 its reverse (1520216231), we get a palindrome (2846336482).

The spelling of 1326120251 in words is "one billion, three hundred twenty-six million, one hundred twenty thousand, two hundred fifty-one".