451661 has 8 divisors (see below), whose sum is σ = 521664. Its totient is φ = 383040.

The previous prime is 451657. The next prime is 451663. The reversal of 451661 is 166154.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 451661 - 2² = 451657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 451661.

It is not an unprimeable number, because it can be changed into a prime (451663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506 + ... + 1076.

It is an arithmetic number, because the mean of its divisors is an integer number (65208).

2⁴⁵¹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

451661 is a deficient number, since it is larger than the sum of its proper divisors (70003).

451661 is a wasteful number, since it uses less digits than its factorization.

451661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691.

The product of its digits is 720, while the sum is 23.

The square root of 451661 is about 672.0572892247. The cubic root of 451661 is about 76.7251119139.

The spelling of 451661 in words is "four hundred fifty-one thousand, six hundred sixty-one".