1311021427 has 2 divisors, whose sum is σ = 1311021428. Its totient is φ = 1311021426.

The previous prime is 1311021421. The next prime is 1311021449. The reversal of 1311021427 is 7241201131.

It is a happy number.

It is an a-pointer prime, because the next prime (1311021449) can be obtained adding 1311021427 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311021427 - 2²³ = 1302632819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311021398 and 1311021407.

It is not a weakly prime, because it can be changed into another prime (1311021421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655510713 + 655510714.

It is an arithmetic number, because the mean of its divisors is an integer number (655510714).

Almost surely, 2^1311021427 is an apocalyptic number.

1311021427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311021427 is an equidigital number, since it uses as much as digits as its factorization.

1311021427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 1311021427 is about 36208.0298690774. The cubic root of 1311021427 is about 1094.4684915198.

Adding to 1311021427 its reverse (7241201131), we get a palindrome (8552222558).

The spelling of 1311021427 in words is "one billion, three hundred eleven million, twenty-one thousand, four hundred twenty-seven".