205005157 has 4 divisors (see below), whose sum is σ = 234291616. Its totient is φ = 175718700.

The previous prime is 205005133. The next prime is 205005167. The reversal of 205005157 is 751500502.

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-205005157 is a prime.

It is a super-2 number, since 2×205005157² = 84054228793189298, 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 (205005107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14643219 + ... + 14643232.

It is an arithmetic number, because the mean of its divisors is an integer number (58572904).

Almost surely, 2^205005157 is an apocalyptic number.

It is an amenable number.

205005157 is a deficient number, since it is larger than the sum of its proper divisors (29286459).

205005157 is an equidigital number, since it uses as much as digits as its factorization.

205005157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29286458.

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 205005157 is about 14318.0011523955. The cubic root of 205005157 is about 589.6417982763.

Adding to 205005157 its reverse (751500502), we get a palindrome (956505659).

The spelling of 205005157 in words is "two hundred five million, five thousand, one hundred fifty-seven".