90843504457 has 2 divisors, whose sum is σ = 90843504458. Its totient is φ = 90843504456.

The previous prime is 90843504449. The next prime is 90843504461. The reversal of 90843504457 is 75440534809.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54448022281 + 36395482176 = 233341^2 + 190776^2 .

It is a cyclic number.

It is not a de Polignac number, because 90843504457 - 2³ = 90843504449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90843504457.

It is not a weakly prime, because it can be changed into another prime (90843505457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45421752228 + 45421752229.

It is an arithmetic number, because the mean of its divisors is an integer number (45421752229).

Almost surely, 2^90843504457 is an apocalyptic number.

It is an amenable number.

90843504457 is a deficient number, since it is larger than the sum of its proper divisors (1).

90843504457 is an equidigital number, since it uses as much as digits as its factorization.

90843504457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2419200, while the sum is 49.

The spelling of 90843504457 in words is "ninety billion, eight hundred forty-three million, five hundred four thousand, four hundred fifty-seven".