2051785729 has 4 divisors (see below), whose sum is σ = 2344897984. Its totient is φ = 1758673476.

The previous prime is 2051785663. The next prime is 2051785741. The reversal of 2051785729 is 9275871502.

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.

It is not a de Polignac number, because 2051785729 - 2⁷ = 2051785601 is a prime.

It is a super-2 number, since 2×2051785729² = 8419649355456122882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2051785789) 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 3 ways as a sum of consecutive naturals, for example, 146556117 + ... + 146556130.

It is an arithmetic number, because the mean of its divisors is an integer number (586224496).

Almost surely, 2^2051785729 is an apocalyptic number.

It is an amenable number.

2051785729 is a deficient number, since it is larger than the sum of its proper divisors (293112255).

2051785729 is an equidigital number, since it uses as much as digits as its factorization.

2051785729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293112254.

The product of its (nonzero) digits is 352800, while the sum is 46.

The square root of 2051785729 is about 45296.6414759417. The cubic root of 2051785729 is about 1270.7028430275.

The spelling of 2051785729 in words is "two billion, fifty-one million, seven hundred eighty-five thousand, seven hundred twenty-nine".