451551 has 4 divisors (see below), whose sum is σ = 602072. Its totient is φ = 301032.

The previous prime is 451547. The next prime is 451553. The reversal of 451551 is 155154.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 451551 - 2² = 451547 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451553) 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, 75256 + ... + 75261.

It is an arithmetic number, because the mean of its divisors is an integer number (150518).

2⁴⁵¹⁵⁵¹ is an apocalyptic number.

451551 is a deficient number, since it is larger than the sum of its proper divisors (150521).

451551 is a wasteful number, since it uses less digits than its factorization.

451551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150520.

The product of its digits is 500, while the sum is 21.

The square root of 451551 is about 671.9754459800. The cubic root of 451551 is about 76.7188827231.

It can be divided in two parts, 45 and 1551, that added together give a triangular number (1596 = T₅₆).

The spelling of 451551 in words is "four hundred fifty-one thousand, five hundred fifty-one".