451213521 has 8 divisors (see below), whose sum is σ = 656310624. Its totient is φ = 273462720.

The previous prime is 451213513. The next prime is 451213547. The reversal of 451213521 is 125312154.

It is a happy number.

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

It is not a de Polignac number, because 451213521 - 2³ = 451213513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 451213491 and 451213500.

It is not an unprimeable number, because it can be changed into a prime (451213421) 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, 6836536 + ... + 6836601.

It is an arithmetic number, because the mean of its divisors is an integer number (82038828).

Almost surely, 2^451213521 is an apocalyptic number.

It is an amenable number.

451213521 is a deficient number, since it is larger than the sum of its proper divisors (205097103).

451213521 is a wasteful number, since it uses less digits than its factorization.

451213521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13673151.

The product of its digits is 1200, while the sum is 24.

The square root of 451213521 is about 21241.7871423287. The cubic root of 451213521 is about 766.9976530738.

Adding to 451213521 its reverse (125312154), we get a palindrome (576525675).

The spelling of 451213521 in words is "four hundred fifty-one million, two hundred thirteen thousand, five hundred twenty-one".