1311421031 has 2 divisors, whose sum is σ = 1311421032. Its totient is φ = 1311421030.

The previous prime is 1311421019. The next prime is 1311421043. The reversal of 1311421031 is 1301241131.

It is a balanced prime because it is at equal distance from previous prime (1311421019) and next prime (1311421043).

It is an emirp because it is prime and its reverse (1301241131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1311421031 - 2²² = 1307226727 is a prime.

It is a super-2 number, since 2×1311421031² = 3439650241098205922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311421091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655710515 + 655710516.

It is an arithmetic number, because the mean of its divisors is an integer number (655710516).

Almost surely, 2^1311421031 is an apocalyptic number.

1311421031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311421031 is an equidigital number, since it uses as much as digits as its factorization.

1311421031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1311421031 is about 36213.5476168795. The cubic root of 1311421031 is about 1094.5796795217.

Adding to 1311421031 its reverse (1301241131), we get a palindrome (2612662162).

The spelling of 1311421031 in words is "one billion, three hundred eleven million, four hundred twenty-one thousand, thirty-one".