2086510991 has 2 divisors, whose sum is σ = 2086510992. Its totient is φ = 2086510990.

The previous prime is 2086510969. The next prime is 2086511041. The reversal of 2086510991 is 1990156802.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2086510991 - 2¹⁴ = 2086494607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2086510901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1043255495 + 1043255496.

It is an arithmetic number, because the mean of its divisors is an integer number (1043255496).

Almost surely, 2^2086510991 is an apocalyptic number.

2086510991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2086510991 is an equidigital number, since it uses as much as digits as its factorization.

2086510991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 2086510991 is about 45678.3426910390. The cubic root of 2086510991 is about 1277.8314092000.

The spelling of 2086510991 in words is "two billion, eighty-six million, five hundred ten thousand, nine hundred ninety-one".