206451 has 24 divisors (see below), whose sum is σ = 355680. Its totient is φ = 112896.

The previous prime is 206447. The next prime is 206461. The reversal of 206451 is 154602.

It is a happy number.

206451 is a `hidden beast` number, since 20 + 645 + 1 = 666.

It is not a de Polignac number, because 206451 - 2² = 206447 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 206451.

It is not an unprimeable number, because it can be changed into a prime (206411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1771 + ... + 1883.

It is an arithmetic number, because the mean of its divisors is an integer number (14820).

2²⁰⁶⁴⁵¹ is an apocalyptic number.

206451 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

206451 is a deficient number, since it is larger than the sum of its proper divisors (149229).

206451 is a wasteful number, since it uses less digits than its factorization.

206451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 206451 is about 454.3687929425. The cubic root of 206451 is about 59.1024744083.

The spelling of 206451 in words is "two hundred six thousand, four hundred fifty-one".