205124641 has 4 divisors (see below), whose sum is σ = 206198784. Its totient is φ = 204050500.

The previous prime is 205124629. The next prime is 205124693. The reversal of 205124641 is 146421502.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205124641 is a prime.

It is a super-2 number, since 2×205124641² = 84152236690757762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205124611) 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, 536785 + ... + 537166.

It is an arithmetic number, because the mean of its divisors is an integer number (51549696).

Almost surely, 2^205124641 is an apocalyptic number.

It is an amenable number.

205124641 is a deficient number, since it is larger than the sum of its proper divisors (1074143).

205124641 is a wasteful number, since it uses less digits than its factorization.

205124641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074142.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 205124641 is about 14322.1730543937. The cubic root of 205124641 is about 589.7563304807.

The spelling of 205124641 in words is "two hundred five million, one hundred twenty-four thousand, six hundred forty-one".