90571729 has 2 divisors, whose sum is σ = 90571730. Its totient is φ = 90571728.

The previous prime is 90571721. The next prime is 90571771. The reversal of 90571729 is 92717509.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57532225 + 33039504 = 7585^2 + 5748^2 .

It is an emirp because it is prime and its reverse (92717509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90571729 - 2³ = 90571721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90571691 and 90571700.

It is not a weakly prime, because it can be changed into another prime (90571721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45285864 + 45285865.

It is an arithmetic number, because the mean of its divisors is an integer number (45285865).

Almost surely, 2^90571729 is an apocalyptic number.

It is an amenable number.

90571729 is a deficient number, since it is larger than the sum of its proper divisors (1).

90571729 is an equidigital number, since it uses as much as digits as its factorization.

90571729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 90571729 is about 9516.9180410467. The cubic root of 90571729 is about 449.0874164084.

The spelling of 90571729 in words is "ninety million, five hundred seventy-one thousand, seven hundred twenty-nine".