451021563 has 12 divisors (see below), whose sum is σ = 685764040. Its totient is φ = 284855616.

The previous prime is 451021531. The next prime is 451021583. The reversal of 451021563 is 365120154.

It is not a de Polignac number, because 451021563 - 2⁵ = 451021531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (451021523) 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, 1318606 + ... + 1318947.

Almost surely, 2^451021563 is an apocalyptic number.

451021563 is a deficient number, since it is larger than the sum of its proper divisors (234742477).

451021563 is a wasteful number, since it uses less digits than its factorization.

451021563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2637578 (or 2637575 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 451021563 is about 21237.2682565343. The cubic root of 451021563 is about 766.8888707107. Note that the first 4 decimals are identical.

It can be divided in two parts, 451021 and 563, that added together give a square (451584 = 672²).

The spelling of 451021563 in words is "four hundred fifty-one million, twenty-one thousand, five hundred sixty-three".