1001011987 has 2 divisors, whose sum is σ = 1001011988. Its totient is φ = 1001011986.

The previous prime is 1001011981. The next prime is 1001012087. The reversal of 1001011987 is 7891101001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1001011987 - 2²⁷ = 866794259 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001011981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500505993 + 500505994.

It is an arithmetic number, because the mean of its divisors is an integer number (500505994).

Almost surely, 2^1001011987 is an apocalyptic number.

1001011987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001011987 is an equidigital number, since it uses as much as digits as its factorization.

1001011987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 28.

The square root of 1001011987 is about 31638.7734749626. The cubic root of 1001011987 is about 1000.3372152731.

Adding to 1001011987 its reverse (7891101001), we get a palindrome (8892112988).

The spelling of 1001011987 in words is "one billion, one million, eleven thousand, nine hundred eighty-seven".