451945081 has 9 divisors (see below), whose sum is σ = 525905199. Its totient is φ = 387253944.

The previous prime is 451945079. The next prime is 451945099. The reversal of 451945081 is 180549154.

The square root of 451945081 is 21259.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 382789225 + 69155856 = 19565^2 + 8316^2 .

It is not a de Polignac number, because 451945081 - 2¹ = 451945079 is a prime.

It is a super-2 number, since 2×451945081² = 408508712480193122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 451945081.

It is not an unprimeable number, because it can be changed into a prime (451945031) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 147295 + ... + 150331.

It is an arithmetic number, because the mean of its divisors is an integer number (58433911).

Almost surely, 2^451945081 is an apocalyptic number.

451945081 is the 21259-th square number.

451945081 is the 10630-th centered octagonal number.

It is an amenable number.

451945081 is a deficient number, since it is larger than the sum of its proper divisors (73960118).

451945081 is an frugal number, since it uses more digits than its factorization.

451945081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6088 (or 3044 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The cubic root of 451945081 is about 767.4119446135.

The spelling of 451945081 in words is "four hundred fifty-one million, nine hundred forty-five thousand, eighty-one".