90641 has 2 divisors, whose sum is σ = 90642. Its totient is φ = 90640.

The previous prime is 90631. The next prime is 90647. The reversal of 90641 is 14609.

90641 is an esthetic number in base 13, because in such base its adjacent digits differ by 1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87616 + 3025 = 296^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 90641 - 2¹⁴ = 74257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a plaindrome in base 12.

It is a nialpdrome in base 11.

It is a zygodrome in base 12.

It is not a weakly prime, because it can be changed into another prime (90647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45320 + 45321.

It is an arithmetic number, because the mean of its divisors is an integer number (45321).

2⁹⁰⁶⁴¹ is an apocalyptic number.

It is an amenable number.

90641 is a deficient number, since it is larger than the sum of its proper divisors (1).

90641 is an equidigital number, since it uses as much as digits as its factorization.

90641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 90641 is about 301.0664378505. The cubic root of 90641 is about 44.9201877463.

The spelling of 90641 in words is "ninety thousand, six hundred forty-one".