205989151 has 4 divisors (see below), whose sum is σ = 208471032. Its totient is φ = 203507272.

The previous prime is 205989067. The next prime is 205989193. The reversal of 205989151 is 151989502.

205989151 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 205989151 - 2¹⁵ = 205956383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205984151) 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, 1240816 + ... + 1240981.

It is an arithmetic number, because the mean of its divisors is an integer number (52117758).

Almost surely, 2^205989151 is an apocalyptic number.

205989151 is a deficient number, since it is larger than the sum of its proper divisors (2481881).

205989151 is an equidigital number, since it uses as much as digits as its factorization.

205989151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2481880.

The product of its (nonzero) digits is 32400, while the sum is 40.

The square root of 205989151 is about 14352.3221466075. The cubic root of 205989151 is about 590.5836902922.

The spelling of 205989151 in words is "two hundred five million, nine hundred eighty-nine thousand, one hundred fifty-one".