1311211487 has 2 divisors, whose sum is σ = 1311211488. Its totient is φ = 1311211486.

The previous prime is 1311211483. The next prime is 1311211493. The reversal of 1311211487 is 7841121131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311211487 - 2² = 1311211483 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311211483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655605743 + 655605744.

It is an arithmetic number, because the mean of its divisors is an integer number (655605744).

Almost surely, 2^1311211487 is an apocalyptic number.

1311211487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311211487 is an equidigital number, since it uses as much as digits as its factorization.

1311211487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 29.

The square root of 1311211487 is about 36210.6543299068. The cubic root of 1311211487 is about 1094.5213776705.

The spelling of 1311211487 in words is "one billion, three hundred eleven million, two hundred eleven thousand, four hundred eighty-seven".