2087709581 has 2 divisors, whose sum is σ = 2087709582. Its totient is φ = 2087709580.

The previous prime is 2087709551. The next prime is 2087709583. The reversal of 2087709581 is 1859077802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1364637481 + 723072100 = 36941^2 + 26890^2 .

It is a cyclic number.

It is not a de Polignac number, because 2087709581 - 2¹⁴ = 2087693197 is a prime.

It is a super-2 number, since 2×2087709581² = 8717062589198391122, which contains 22 as substring.

Together with 2087709583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2087709583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1043854790 + 1043854791.

It is an arithmetic number, because the mean of its divisors is an integer number (1043854791).

Almost surely, 2^2087709581 is an apocalyptic number.

It is an amenable number.

2087709581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2087709581 is an equidigital number, since it uses as much as digits as its factorization.

2087709581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 47.

The square root of 2087709581 is about 45691.4607010982. The cubic root of 2087709581 is about 1278.0760445067.

The spelling of 2087709581 in words is "two billion, eighty-seven million, seven hundred nine thousand, five hundred eighty-one".