42781553 has 2 divisors, whose sum is σ = 42781554. Its totient is φ = 42781552.

The previous prime is 42781523. The next prime is 42781561. The reversal of 42781553 is 35518724.

It is a happy number.

42781553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33097009 + 9684544 = 5753^2 + 3112^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42781553 is a prime.

It is a super-2 number, since 2×42781553² = 3660522554183618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42781523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21390776 + 21390777.

It is an arithmetic number, because the mean of its divisors is an integer number (21390777).

Almost surely, 2^42781553 is an apocalyptic number.

It is an amenable number.

42781553 is a deficient number, since it is larger than the sum of its proper divisors (1).

42781553 is an equidigital number, since it uses as much as digits as its factorization.

42781553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33600, while the sum is 35.

The square root of 42781553 is about 6540.7608884594. The cubic root of 42781553 is about 349.7455374905.

It can be divided in two parts, 42781 and 553, that added together give a palindrome (43334).

The spelling of 42781553 in words is "forty-two million, seven hundred eighty-one thousand, five hundred fifty-three".