451561 has 4 divisors (see below), whose sum is σ = 492624. Its totient is φ = 410500.

The previous prime is 451553. The next prime is 451579. The reversal of 451561 is 165154.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 451561 - 2³ = 451553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (451541) 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, 20515 + ... + 20536.

It is an arithmetic number, because the mean of its divisors is an integer number (123156).

2⁴⁵¹⁵⁶¹ is an apocalyptic number.

It is an amenable number.

451561 is a deficient number, since it is larger than the sum of its proper divisors (41063).

451561 is a wasteful number, since it uses less digits than its factorization.

451561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41062.

The product of its digits is 600, while the sum is 22.

The square root of 451561 is about 671.9828866869. The cubic root of 451561 is about 76.7194490550.

The spelling of 451561 in words is "four hundred fifty-one thousand, five hundred sixty-one".