90543643 has 2 divisors, whose sum is σ = 90543644. Its totient is φ = 90543642.

The previous prime is 90543641. The next prime is 90543659. The reversal of 90543643 is 34634509.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90543643 - 2¹ = 90543641 is a prime.

It is a super-2 number, since 2×90543643² = 16396302575422898, which contains 22 as substring.

Together with 90543641, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 90543599 and 90543608.

It is not a weakly prime, because it can be changed into another prime (90543641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45271821 + 45271822.

It is an arithmetic number, because the mean of its divisors is an integer number (45271822).

Almost surely, 2^90543643 is an apocalyptic number.

90543643 is a deficient number, since it is larger than the sum of its proper divisors (1).

90543643 is an equidigital number, since it uses as much as digits as its factorization.

90543643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 90543643 is about 9515.4423438955. The cubic root of 90543643 is about 449.0409914246.

The spelling of 90543643 in words is "ninety million, five hundred forty-three thousand, six hundred forty-three".