1311001031 has 2 divisors, whose sum is σ = 1311001032. Its totient is φ = 1311001030.

The previous prime is 1311001009. The next prime is 1311001037. The reversal of 1311001031 is 1301001131.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1311001031 - 2⁶ = 1311000967 is a prime.

It is a super-2 number, since 2×1311001031² = 3437447406566125922, 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 (1311001037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655500515 + 655500516.

It is an arithmetic number, because the mean of its divisors is an integer number (655500516).

Almost surely, 2^1311001031 is an apocalyptic number.

1311001031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311001031 is an equidigital number, since it uses as much as digits as its factorization.

1311001031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9, while the sum is 11.

The square root of 1311001031 is about 36207.7482177503. The cubic root of 1311001031 is about 1094.4628158192.

Adding to 1311001031 its reverse (1301001131), we get a palindrome (2612002162).

The spelling of 1311001031 in words is "one billion, three hundred eleven million, one thousand, thirty-one".