205151161 has 4 divisors (see below), whose sum is σ = 206966772. Its totient is φ = 203335552.

The previous prime is 205151159. The next prime is 205151171. The reversal of 205151161 is 161151502.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8590761 + 196560400 = 2931^2 + 14020^2 .

It is a cyclic number.

It is not a de Polignac number, because 205151161 - 2¹ = 205151159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205151131) 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, 907636 + ... + 907861.

It is an arithmetic number, because the mean of its divisors is an integer number (51741693).

Almost surely, 2^205151161 is an apocalyptic number.

It is an amenable number.

205151161 is a deficient number, since it is larger than the sum of its proper divisors (1815611).

205151161 is a wasteful number, since it uses less digits than its factorization.

205151161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1815610.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 205151161 is about 14323.0988616291. The cubic root of 205151161 is about 589.7817453761.

The spelling of 205151161 in words is "two hundred five million, one hundred fifty-one thousand, one hundred sixty-one".