1021151987 has 2 divisors, whose sum is σ = 1021151988. Its totient is φ = 1021151986.

The previous prime is 1021151977. The next prime is 1021152001. The reversal of 1021151987 is 7891511201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021151987 - 2⁸ = 1021151731 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021151927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510575993 + 510575994.

It is an arithmetic number, because the mean of its divisors is an integer number (510575994).

Almost surely, 2^1021151987 is an apocalyptic number.

1021151987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021151987 is an equidigital number, since it uses as much as digits as its factorization.

1021151987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 35.

The square root of 1021151987 is about 31955.4688120829. The cubic root of 1021151987 is about 1007.0015265511.

The spelling of 1021151987 in words is "one billion, twenty-one million, one hundred fifty-one thousand, nine hundred eighty-seven".