90697543 has 2 divisors, whose sum is σ = 90697544. Its totient is φ = 90697542.

The previous prime is 90697531. The next prime is 90697549. The reversal of 90697543 is 34579609.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90697543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90697543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90697549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45348771 + 45348772.

It is an arithmetic number, because the mean of its divisors is an integer number (45348772).

Almost surely, 2^90697543 is an apocalyptic number.

90697543 is a deficient number, since it is larger than the sum of its proper divisors (1).

90697543 is an equidigital number, since it uses as much as digits as its factorization.

90697543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 90697543 is about 9523.5257651775. The cubic root of 90697543 is about 449.2952639813.

The spelling of 90697543 in words is "ninety million, six hundred ninety-seven thousand, five hundred forty-three".