1215301987 has 2 divisors, whose sum is σ = 1215301988. Its totient is φ = 1215301986.

The previous prime is 1215301981. The next prime is 1215302003. The reversal of 1215301987 is 7891035121.

It is a weak prime.

It is an emirp because it is prime and its reverse (7891035121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1215301987 - 2³ = 1215301979 is a prime.

It is a super-2 number, since 2×1215301987² = 2953917839212296338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1215301981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607650993 + 607650994.

It is an arithmetic number, because the mean of its divisors is an integer number (607650994).

Almost surely, 2^1215301987 is an apocalyptic number.

1215301987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215301987 is an equidigital number, since it uses as much as digits as its factorization.

1215301987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 1215301987 is about 34861.1816638507. The cubic root of 1215301987 is about 1067.1563902408.

The spelling of 1215301987 in words is "one billion, two hundred fifteen million, three hundred one thousand, nine hundred eighty-seven".