90450001 has 4 divisors (see below), whose sum is σ = 90574132. Its totient is φ = 90325872.

The previous prime is 90449987. The next prime is 90450071. The reversal of 90450001 is 10005409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10005409 = 211 ⋅47419.

It can be written as a sum of positive squares in 2 ways, for example, as 89283601 + 1166400 = 9449^2 + 1080^2 .

It is a cyclic number.

It is not a de Polignac number, because 90450001 - 2⁵ = 90449969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90450071) 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, 60966 + ... + 62431.

It is an arithmetic number, because the mean of its divisors is an integer number (22643533).

Almost surely, 2^90450001 is an apocalyptic number.

It is an amenable number.

90450001 is a deficient number, since it is larger than the sum of its proper divisors (124131).

90450001 is a wasteful number, since it uses less digits than its factorization.

90450001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124130.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 90450001 is about 9510.5205430618. The cubic root of 90450001 is about 448.8861357128.

It can be divided in two parts, 904 and 50001, that added together give a palindrome (50905).

The spelling of 90450001 in words is "ninety million, four hundred fifty thousand, one".