90242057 has 2 divisors, whose sum is σ = 90242058. Its totient is φ = 90242056.

The previous prime is 90242029. The next prime is 90242059. The reversal of 90242057 is 75024209.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75411856 + 14830201 = 8684^2 + 3851^2 .

It is a cyclic number.

It is not a de Polignac number, because 90242057 - 2¹⁴ = 90225673 is a prime.

Together with 90242059, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90242059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45121028 + 45121029.

It is an arithmetic number, because the mean of its divisors is an integer number (45121029).

Almost surely, 2^90242057 is an apocalyptic number.

It is an amenable number.

90242057 is a deficient number, since it is larger than the sum of its proper divisors (1).

90242057 is an equidigital number, since it uses as much as digits as its factorization.

90242057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 90242057 is about 9499.5819381697. The cubic root of 90242057 is about 448.5418762661.

The spelling of 90242057 in words is "ninety million, two hundred forty-two thousand, fifty-seven".