451040081 has 4 divisors (see below), whose sum is σ = 451195572.
Its totient is φ = 450884592.
The previous prime is 451040077. The next prime is 451040087. The reversal of 451040081 is 180040154.
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 206899456 + 244140625 = 14384^2 + 15625^2
It is a cyclic number.
It is not a de Polignac number, because 451040081 - 22 = 451040077 is a prime.
It is a super-2 number, since 2×4510400812 = 406874309336973122, which contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (451040087) 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, 73310 + ... + 79223.
It is an arithmetic number, because the mean of its divisors is an integer number (112798893).
Almost surely, 2451040081 is an apocalyptic number.
It is an amenable number.
451040081 is a deficient number, since it is larger than the sum of its proper divisors (155491).
451040081 is a wasteful number, since it uses less digits than its factorization.
451040081 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 155490.
The product of its (nonzero) digits is 640, while the sum is 23.
The square root of 451040081 is about 21237.7042309191.
The cubic root of 451040081 is about 766.8993661836.
The spelling of 451040081 in words is "four hundred fifty-one million, forty thousand, eighty-one".