42831557 has 2 divisors, whose sum is σ = 42831558. Its totient is φ = 42831556.

The previous prime is 42831541. The next prime is 42831583. The reversal of 42831557 is 75513824.

It is a happy number.

42831557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41357761 + 1473796 = 6431^2 + 1214^2 .

It is a cyclic number.

It is not a de Polignac number, because 42831557 - 2⁴ = 42831541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42831527) 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, 21415778 + 21415779.

It is an arithmetic number, because the mean of its divisors is an integer number (21415779).

Almost surely, 2^42831557 is an apocalyptic number.

It is an amenable number.

42831557 is a deficient number, since it is larger than the sum of its proper divisors (1).

42831557 is an equidigital number, since it uses as much as digits as its factorization.

42831557 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 42831557 is about 6544.5822632159. The cubic root of 42831557 is about 349.8817478065.

The spelling of 42831557 in words is "forty-two million, eight hundred thirty-one thousand, five hundred fifty-seven".