451331421 has 4 divisors (see below), whose sum is σ = 601775232. Its totient is φ = 300887612.

The previous prime is 451331417. The next prime is 451331423. The reversal of 451331421 is 124133154.

It is a happy number.

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 451331421 - 2² = 451331417 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 451331391 and 451331400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451331423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75221901 + ... + 75221906.

It is an arithmetic number, because the mean of its divisors is an integer number (150443808).

Almost surely, 2^451331421 is an apocalyptic number.

It is an amenable number.

451331421 is a deficient number, since it is larger than the sum of its proper divisors (150443811).

451331421 is a wasteful number, since it uses less digits than its factorization.

451331421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150443810.

The product of its digits is 1440, while the sum is 24.

The square root of 451331421 is about 21244.5621512894. The cubic root of 451331421 is about 767.0644515657.

Adding to 451331421 its reverse (124133154), we get a palindrome (575464575).

The spelling of 451331421 in words is "four hundred fifty-one million, three hundred thirty-one thousand, four hundred twenty-one".