451321520 has 40 divisors (see below), whose sum is σ = 1130042256. Its totient is φ = 166641408.

The previous prime is 451321513. The next prime is 451321537. The reversal of 451321520 is 25123154.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×451321520² = 407382228830220800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215942 + ... + 218021.

Almost surely, 2^451321520 is an apocalyptic number.

451321520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

451321520 is an abundant number, since it is smaller than the sum of its proper divisors (678720736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

451321520 is a wasteful number, since it uses less digits than its factorization.

451321520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433989 (or 433983 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 451321520 is about 21244.3291256749. The cubic root of 451321520 is about 767.0588424129.

Adding to 451321520 its reverse (25123154), we get a palindrome (476444674).

The spelling of 451321520 in words is "four hundred fifty-one million, three hundred twenty-one thousand, five hundred twenty".