450909091 has 4 divisors (see below), whose sum is σ = 451383192. Its totient is φ = 450434992.

The previous prime is 450909077. The next prime is 450909097. The reversal of 450909091 is 190909054.

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

It is a cyclic number.

It is not a de Polignac number, because 450909091 - 2⁷ = 450908963 is a prime.

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 450909091.

It is not an unprimeable number, because it can be changed into a prime (450909097) 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, 235621 + ... + 237526.

It is an arithmetic number, because the mean of its divisors is an integer number (112845798).

Almost surely, 2^450909091 is an apocalyptic number.

450909091 is a deficient number, since it is larger than the sum of its proper divisors (474101).

450909091 is an equidigital number, since it uses as much as digits as its factorization.

450909091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474100.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 450909091 is about 21234.6201049136. The cubic root of 450909091 is about 766.8251186252.

Subtracting from 450909091 its sum of digits (37), we obtain a palindrome (450909054).

It can be divided in two parts, 4 and 50909091, that added together give a triangular number (50909095 = T₁₀₀₉₀).

The spelling of 450909091 in words is "four hundred fifty million, nine hundred nine thousand, ninety-one".