90444001 has 2 divisors, whose sum is σ = 90444002. Its totient is φ = 90444000.

The previous prime is 90443999. The next prime is 90444059. The reversal of 90444001 is 10044409.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75272976 + 15171025 = 8676^2 + 3895^2 .

It is a cyclic number.

It is not a de Polignac number, because 90444001 - 2¹ = 90443999 is a prime.

Together with 90443999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (90444091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45222000 + 45222001.

It is an arithmetic number, because the mean of its divisors is an integer number (45222001).

Almost surely, 2^90444001 is an apocalyptic number.

It is an amenable number.

90444001 is a deficient number, since it is larger than the sum of its proper divisors (1).

90444001 is an equidigital number, since it uses as much as digits as its factorization.

90444001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 90444001 is about 9510.2050976832. The cubic root of 90444001 is about 448.8762098741.

The spelling of 90444001 in words is "ninety million, four hundred forty-four thousand, one".