450725021 has 4 divisors (see below), whose sum is σ = 454713852. Its totient is φ = 446736192.

The previous prime is 450724991. The next prime is 450725039. The reversal of 450725021 is 120527054.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 207676921 + 243048100 = 14411^2 + 15590^2 .

It is a cyclic number.

It is not a de Polignac number, because 450725021 - 2¹⁸ = 450462877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (450725521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1994246 + ... + 1994471.

It is an arithmetic number, because the mean of its divisors is an integer number (113678463).

Almost surely, 2^450725021 is an apocalyptic number.

It is an amenable number.

450725021 is a deficient number, since it is larger than the sum of its proper divisors (3988831).

450725021 is a wasteful number, since it uses less digits than its factorization.

450725021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3988830.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 450725021 is about 21230.2854667572. The cubic root of 450725021 is about 766.7207600354.

The spelling of 450725021 in words is "four hundred fifty million, seven hundred twenty-five thousand, twenty-one".