1321243151 has 2 divisors, whose sum is σ = 1321243152. Its totient is φ = 1321243150.

The previous prime is 1321243127. The next prime is 1321243199. The reversal of 1321243151 is 1513421231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321243151 - 2⁶ = 1321243087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321243351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660621575 + 660621576.

It is an arithmetic number, because the mean of its divisors is an integer number (660621576).

Almost surely, 2^1321243151 is an apocalyptic number.

1321243151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321243151 is an equidigital number, since it uses as much as digits as its factorization.

1321243151 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1321243151 is about 36348.9085255665. The cubic root of 1321243151 is about 1097.3055682328.

Adding to 1321243151 its reverse (1513421231), we get a palindrome (2834664382).

The spelling of 1321243151 in words is "one billion, three hundred twenty-one million, two hundred forty-three thousand, one hundred fifty-one".