2091677851 has 4 divisors (see below), whose sum is σ = 2091801712. Its totient is φ = 2091553992.

The previous prime is 2091677831. The next prime is 2091677899. The reversal of 2091677851 is 1587761902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1587761902 = 2 ⋅793880951.

It is a cyclic number.

It is not a de Polignac number, because 2091677851 - 2⁷ = 2091677723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2091677831) 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, 31671 + ... + 72016.

It is an arithmetic number, because the mean of its divisors is an integer number (522950428).

Almost surely, 2^2091677851 is an apocalyptic number.

2091677851 is a deficient number, since it is larger than the sum of its proper divisors (123861).

2091677851 is a wasteful number, since it uses less digits than its factorization.

2091677851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123860.

The product of its (nonzero) digits is 211680, while the sum is 46.

The square root of 2091677851 is about 45734.8647204734. The cubic root of 2091677851 is about 1278.8853110890.

The spelling of 2091677851 in words is "two billion, ninety-one million, six hundred seventy-seven thousand, eight hundred fifty-one".