2591999987 has 2 divisors, whose sum is σ = 2591999988. Its totient is φ = 2591999986.

The previous prime is 2591999957. The next prime is 2592000031. The reversal of 2591999987 is 7899991952.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2591999987 - 2⁶ = 2591999923 is a prime.

It is not a weakly prime, because it can be changed into another prime (2591999957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1295999993 + 1295999994.

It is an arithmetic number, because the mean of its divisors is an integer number (1295999994).

Almost surely, 2^2591999987 is an apocalyptic number.

2591999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2591999987 is an equidigital number, since it uses as much as digits as its factorization.

2591999987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33067440, while the sum is 68.

The square root of 2591999987 is about 50911.6881177594. The cubic root of 2591999987 is about 1373.6570887675.

The spelling of 2591999987 in words is "two billion, five hundred ninety-one million, nine hundred ninety-nine thousand, nine hundred eighty-seven".