205401571 has 4 divisors (see below), whose sum is σ = 216212200. Its totient is φ = 194590944.

The previous prime is 205401563. The next prime is 205401589. The reversal of 205401571 is 175104502.

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 205401571 - 2³ = 205401563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205401271) 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, 5405286 + ... + 5405323.

It is an arithmetic number, because the mean of its divisors is an integer number (54053050).

Almost surely, 2^205401571 is an apocalyptic number.

205401571 is a deficient number, since it is larger than the sum of its proper divisors (10810629).

205401571 is a wasteful number, since it uses less digits than its factorization.

205401571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10810628.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 205401571 is about 14331.8376700268. The cubic root of 205401571 is about 590.0216127293.

The spelling of 205401571 in words is "two hundred five million, four hundred one thousand, five hundred seventy-one".