42003553 has 2 divisors, whose sum is σ = 42003554. Its totient is φ = 42003552.

The previous prime is 42003551. The next prime is 42003581. The reversal of 42003553 is 35530024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37307664 + 4695889 = 6108^2 + 2167^2 .

It is a cyclic number.

It is not a de Polignac number, because 42003553 - 2¹ = 42003551 is a prime.

Together with 42003551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42003551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21001776 + 21001777.

It is an arithmetic number, because the mean of its divisors is an integer number (21001777).

Almost surely, 2^42003553 is an apocalyptic number.

It is an amenable number.

42003553 is a deficient number, since it is larger than the sum of its proper divisors (1).

42003553 is an equidigital number, since it uses as much as digits as its factorization.

42003553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 22.

The square root of 42003553 is about 6481.0148125120. The cubic root of 42003553 is about 347.6124660556.

Adding to 42003553 its reverse (35530024), we get a palindrome (77533577).

The spelling of 42003553 in words is "forty-two million, three thousand, five hundred fifty-three".