1023121987 has 2 divisors, whose sum is σ = 1023121988. Its totient is φ = 1023121986.

The previous prime is 1023121973. The next prime is 1023121997. The reversal of 1023121987 is 7891213201.

It is a strong prime.

It is an emirp because it is prime and its reverse (7891213201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1023121987 - 2⁷ = 1023121859 is a prime.

It is not a weakly prime, because it can be changed into another prime (1023121907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511560993 + 511560994.

It is an arithmetic number, because the mean of its divisors is an integer number (511560994).

Almost surely, 2^1023121987 is an apocalyptic number.

1023121987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023121987 is an equidigital number, since it uses as much as digits as its factorization.

1023121987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 1023121987 is about 31986.2781048374. The cubic root of 1023121987 is about 1007.6486775763.

The spelling of 1023121987 in words is "one billion, twenty-three million, one hundred twenty-one thousand, nine hundred eighty-seven".