1012021987 has 2 divisors, whose sum is σ = 1012021988. Its totient is φ = 1012021986.

The previous prime is 1012021973. The next prime is 1012021991. The reversal of 1012021987 is 7891202101.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1012021987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1012021957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506010993 + 506010994.

It is an arithmetic number, because the mean of its divisors is an integer number (506010994).

Almost surely, 2^1012021987 is an apocalyptic number.

1012021987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012021987 is an equidigital number, since it uses as much as digits as its factorization.

1012021987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 1012021987 is about 31812.2930170084. The cubic root of 1012021987 is about 1003.9913767163.

The spelling of 1012021987 in words is "one billion, twelve million, twenty-one thousand, nine hundred eighty-seven".