90442643 has 2 divisors, whose sum is σ = 90442644. Its totient is φ = 90442642.

The previous prime is 90442637. The next prime is 90442657. The reversal of 90442643 is 34624409.

It is a weak prime.

It is an emirp because it is prime and its reverse (34624409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90442643 - 2¹⁰ = 90441619 is a prime.

It is not a weakly prime, because it can be changed into another prime (90442663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45221321 + 45221322.

It is an arithmetic number, because the mean of its divisors is an integer number (45221322).

Almost surely, 2^90442643 is an apocalyptic number.

90442643 is a deficient number, since it is larger than the sum of its proper divisors (1).

90442643 is an equidigital number, since it uses as much as digits as its factorization.

90442643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 90442643 is about 9510.1337004271. The cubic root of 90442643 is about 448.8739632650.

The spelling of 90442643 in words is "ninety million, four hundred forty-two thousand, six hundred forty-three".