2087181309 has 4 divisors (see below), whose sum is σ = 2782908416. Its totient is φ = 1391454204.

The previous prime is 2087181281. The next prime is 2087181337. The reversal of 2087181309 is 9031817802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2087181281) and next prime (2087181337).

It is not a de Polignac number, because 2087181309 - 2²⁴ = 2070404093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2087181379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347863549 + ... + 347863554.

It is an arithmetic number, because the mean of its divisors is an integer number (695727104).

Almost surely, 2^2087181309 is an apocalyptic number.

It is an amenable number.

2087181309 is a deficient number, since it is larger than the sum of its proper divisors (695727107).

2087181309 is an equidigital number, since it uses as much as digits as its factorization.

2087181309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695727106.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 2087181309 is about 45685.6794739883. The cubic root of 2087181309 is about 1277.9682343735.

The spelling of 2087181309 in words is "two billion, eighty-seven million, one hundred eighty-one thousand, three hundred nine".