2086499861 has 4 divisors (see below), whose sum is σ = 2088863712. Its totient is φ = 2084136012.

The previous prime is 2086499843. The next prime is 2086499869. The reversal of 2086499861 is 1689946802.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1689946802 = 2 ⋅844973401.

It is a cyclic number.

It is not a de Polignac number, because 2086499861 - 2¹⁸ = 2086237717 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 (2086499869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1180601 + ... + 1182366.

It is an arithmetic number, because the mean of its divisors is an integer number (522215928).

Almost surely, 2^2086499861 is an apocalyptic number.

It is an amenable number.

2086499861 is a deficient number, since it is larger than the sum of its proper divisors (2363851).

2086499861 is an equidigital number, since it uses as much as digits as its factorization.

2086499861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363850.

The product of its (nonzero) digits is 1492992, while the sum is 53.

The square root of 2086499861 is about 45678.2208607122. The cubic root of 2086499861 is about 1277.8291370994.

The spelling of 2086499861 in words is "two billion, eighty-six million, four hundred ninety-nine thousand, eight hundred sixty-one".