1330121987 has 2 divisors, whose sum is σ = 1330121988. Its totient is φ = 1330121986.

The previous prime is 1330121981. The next prime is 1330122011. The reversal of 1330121987 is 7891210331.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1330121987 - 2¹² = 1330117891 is a prime.

It is not a weakly prime, because it can be changed into another prime (1330121981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665060993 + 665060994.

It is an arithmetic number, because the mean of its divisors is an integer number (665060994).

Almost surely, 2^1330121987 is an apocalyptic number.

1330121987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1330121987 is an equidigital number, since it uses as much as digits as its factorization.

1330121987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 1330121987 is about 36470.8374869566. The cubic root of 1330121987 is about 1099.7580699352.

The spelling of 1330121987 in words is "one billion, three hundred thirty million, one hundred twenty-one thousand, nine hundred eighty-seven".