2013121987 has 2 divisors, whose sum is σ = 2013121988. Its totient is φ = 2013121986.

The previous prime is 2013121973. The next prime is 2013121993. The reversal of 2013121987 is 7891213102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2013121987 is a prime.

It is not a weakly prime, because it can be changed into another prime (2013121967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1006560993 + 1006560994.

It is an arithmetic number, because the mean of its divisors is an integer number (1006560994).

Almost surely, 2^2013121987 is an apocalyptic number.

2013121987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2013121987 is an equidigital number, since it uses as much as digits as its factorization.

2013121987 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 2013121987 is about 44867.8279728359. The cubic root of 2013121987 is about 1262.6704902195.

The spelling of 2013121987 in words is "two billion, thirteen million, one hundred twenty-one thousand, nine hundred eighty-seven".