90401789 has 2 divisors, whose sum is σ = 90401790. Its totient is φ = 90401788.

The previous prime is 90401783. The next prime is 90401807. The reversal of 90401789 is 98710409.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74736025 + 15665764 = 8645^2 + 3958^2 .

It is a cyclic number.

It is not a de Polignac number, because 90401789 - 2⁸ = 90401533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90401783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45200894 + 45200895.

It is an arithmetic number, because the mean of its divisors is an integer number (45200895).

Almost surely, 2^90401789 is an apocalyptic number.

It is an amenable number.

90401789 is a deficient number, since it is larger than the sum of its proper divisors (1).

90401789 is an equidigital number, since it uses as much as digits as its factorization.

90401789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 90401789 is about 9507.9855384829. The cubic root of 90401789 is about 448.8063658788.

The spelling of 90401789 in words is "ninety million, four hundred one thousand, seven hundred eighty-nine".