451194021 has 12 divisors (see below), whose sum is σ = 669339372. Its totient is φ = 292666176.

The previous prime is 451193989. The next prime is 451194047. The reversal of 451194021 is 120491154.

451194021 is a `hidden beast` number, since 451 + 194 + 0 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 265853025 + 185340996 = 16305^2 + 13614^2 .

It is not a de Polignac number, because 451194021 - 2⁵ = 451193989 is a prime.

It is a super-2 number, since 2×451194021² = 407152089172296882, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451194071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 677136 + ... + 677801.

It is an arithmetic number, because the mean of its divisors is an integer number (55778281).

Almost surely, 2^451194021 is an apocalyptic number.

It is an amenable number.

451194021 is a deficient number, since it is larger than the sum of its proper divisors (218145351).

451194021 is a wasteful number, since it uses less digits than its factorization.

451194021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354980 (or 1354977 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 451194021 is about 21241.3281364419. The cubic root of 451194021 is about 766.9866038557.

It can be divided in two parts, 4 and 51194021, that added together give a square (51194025 = 7155²).

The spelling of 451194021 in words is "four hundred fifty-one million, one hundred ninety-four thousand, twenty-one".