90571601 has 2 divisors, whose sum is σ = 90571602. Its totient is φ = 90571600.

The previous prime is 90571543. The next prime is 90571721. The reversal of 90571601 is 10617509.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90345025 + 226576 = 9505^2 + 476^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90571601 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90501601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45285800 + 45285801.

It is an arithmetic number, because the mean of its divisors is an integer number (45285801).

Almost surely, 2^90571601 is an apocalyptic number.

It is an amenable number.

90571601 is a deficient number, since it is larger than the sum of its proper divisors (1).

90571601 is an equidigital number, since it uses as much as digits as its factorization.

90571601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 90571601 is about 9516.9113161782. The cubic root of 90571601 is about 449.0872048515.

The spelling of 90571601 in words is "ninety million, five hundred seventy-one thousand, six hundred one".