1311022051 has 2 divisors, whose sum is σ = 1311022052. Its totient is φ = 1311022050.

The previous prime is 1311022049. The next prime is 1311022061. The reversal of 1311022051 is 1502201131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311022051 - 2¹ = 1311022049 is a prime.

Together with 1311022049, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1311022061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655511025 + 655511026.

It is an arithmetic number, because the mean of its divisors is an integer number (655511026).

Almost surely, 2^1311022051 is an apocalyptic number.

1311022051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311022051 is an equidigital number, since it uses as much as digits as its factorization.

1311022051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1311022051 is about 36208.0384859495. The cubic root of 1311022051 is about 1094.4686651626.

Adding to 1311022051 its reverse (1502201131), we get a palindrome (2813223182).

The spelling of 1311022051 in words is "one billion, three hundred eleven million, twenty-two thousand, fifty-one".