2051604691 has 8 divisors (see below), whose sum is σ = 2113412400. Its totient is φ = 1990437792.

The previous prime is 2051604679. The next prime is 2051604697. The reversal of 2051604691 is 1964061502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2051604691 - 2⁷ = 2051604563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2051604697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153700 + ... + 166513.

It is an arithmetic number, because the mean of its divisors is an integer number (264176550).

Almost surely, 2^2051604691 is an apocalyptic number.

2051604691 is a deficient number, since it is larger than the sum of its proper divisors (61807709).

2051604691 is a wasteful number, since it uses less digits than its factorization.

2051604691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320405.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 2051604691 is about 45294.6430717806. The cubic root of 2051604691 is about 1270.6654687110.

The spelling of 2051604691 in words is "two billion, fifty-one million, six hundred four thousand, six hundred ninety-one".