1323509987 has 2 divisors, whose sum is σ = 1323509988. Its totient is φ = 1323509986.

The previous prime is 1323509981. The next prime is 1323510047. The reversal of 1323509987 is 7899053231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1323509987 - 2¹² = 1323505891 is a prime.

It is not a weakly prime, because it can be changed into another prime (1323509981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661754993 + 661754994.

It is an arithmetic number, because the mean of its divisors is an integer number (661754994).

Almost surely, 2^1323509987 is an apocalyptic number.

1323509987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323509987 is an equidigital number, since it uses as much as digits as its factorization.

1323509987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 1323509987 is about 36380.0767866150. The cubic root of 1323509987 is about 1097.9327529615.

The spelling of 1323509987 in words is "one billion, three hundred twenty-three million, five hundred nine thousand, nine hundred eighty-seven".