451669 has 2 divisors, whose sum is σ = 451670. Its totient is φ = 451668.

The previous prime is 451667. The next prime is 451679. The reversal of 451669 is 966154.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 439569 + 12100 = 663^2 + 110^2 .

It is a cyclic number.

It is not a de Polignac number, because 451669 - 2¹ = 451667 is a prime.

It is a super-2 number, since 2×451669² = 408009771122, which contains 22 as substring.

Together with 451667, it forms a pair of twin primes.

It is an Ulam number.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 451669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (451663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225834 + 225835.

It is an arithmetic number, because the mean of its divisors is an integer number (225835).

2⁴⁵¹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

451669 is a deficient number, since it is larger than the sum of its proper divisors (1).

451669 is an equidigital number, since it uses as much as digits as its factorization.

451669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 451669 is about 672.0632410719. The cubic root of 451669 is about 76.7255649065.

The spelling of 451669 in words is "four hundred fifty-one thousand, six hundred sixty-nine".