205505151 has 4 divisors (see below), whose sum is σ = 274006872. Its totient is φ = 137003432.

The previous prime is 205505137. The next prime is 205505171. The reversal of 205505151 is 151505502.

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 205505151 - 2⁶ = 205505087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205505101) 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, 34250856 + ... + 34250861.

It is an arithmetic number, because the mean of its divisors is an integer number (68501718).

Almost surely, 2^205505151 is an apocalyptic number.

205505151 is a deficient number, since it is larger than the sum of its proper divisors (68501721).

205505151 is an equidigital number, since it uses as much as digits as its factorization.

205505151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68501720.

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 205505151 is about 14335.4508474620. The cubic root of 205505151 is about 590.1207748540.

The spelling of 205505151 in words is "two hundred five million, five hundred five thousand, one hundred fifty-one".