205996751 has 4 divisors (see below), whose sum is σ = 211021104. Its totient is φ = 200972400.

The previous prime is 205996697. The next prime is 205996753. The reversal of 205996751 is 157699502.

It is a happy number.

205996751 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 205996751 - 2²⁶ = 138887887 is a prime.

It is a super-2 number, since 2×205996751² = 84869322845112002, 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 (205996753) 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, 2512115 + ... + 2512196.

It is an arithmetic number, because the mean of its divisors is an integer number (52755276).

Almost surely, 2^205996751 is an apocalyptic number.

205996751 is a deficient number, since it is larger than the sum of its proper divisors (5024353).

205996751 is an equidigital number, since it uses as much as digits as its factorization.

205996751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5024352.

The product of its (nonzero) digits is 170100, while the sum is 44.

The square root of 205996751 is about 14352.5869096829. The cubic root of 205996751 is about 590.5909534269.

The spelling of 205996751 in words is "two hundred five million, nine hundred ninety-six thousand, seven hundred fifty-one".