2051977693 has 4 divisors (see below), whose sum is σ = 2059962300. Its totient is φ = 2043993088.

The previous prime is 2051977691. The next prime is 2051977703. The reversal of 2051977693 is 3967791502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 978563524 + 1073414169 = 31282^2 + 32763^2 .

It is a cyclic number.

It is not a de Polignac number, because 2051977693 - 2¹ = 2051977691 is a prime.

It is a super-2 number, since 2×2051977693² = 8421224905139204498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051977691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3991918 + ... + 3992431.

It is an arithmetic number, because the mean of its divisors is an integer number (514990575).

Almost surely, 2^2051977693 is an apocalyptic number.

It is an amenable number.

2051977693 is a deficient number, since it is larger than the sum of its proper divisors (7984607).

2051977693 is an equidigital number, since it uses as much as digits as its factorization.

2051977693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7984606.

The product of its (nonzero) digits is 714420, while the sum is 49.

The square root of 2051977693 is about 45298.7603914279. The cubic root of 2051977693 is about 1270.7424705562.

The spelling of 2051977693 in words is "two billion, fifty-one million, nine hundred seventy-seven thousand, six hundred ninety-three".