1321047887 has 2 divisors, whose sum is σ = 1321047888. Its totient is φ = 1321047886.

The previous prime is 1321047881. The next prime is 1321047907. The reversal of 1321047887 is 7887401231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321047887 - 2⁶ = 1321047823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321047881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660523943 + 660523944.

It is an arithmetic number, because the mean of its divisors is an integer number (660523944).

Almost surely, 2^1321047887 is an apocalyptic number.

1321047887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321047887 is an equidigital number, since it uses as much as digits as its factorization.

1321047887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 1321047887 is about 36346.2224584619. Note that the first 3 decimals coincide. The cubic root of 1321047887 is about 1097.2515093387.

The spelling of 1321047887 in words is "one billion, three hundred twenty-one million, forty-seven thousand, eight hundred eighty-seven".