42731573 has 2 divisors, whose sum is σ = 42731574. Its totient is φ = 42731572.

The previous prime is 42731543. The next prime is 42731581. The reversal of 42731573 is 37513724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37246609 + 5484964 = 6103^2 + 2342^2 .

It is a cyclic number.

It is not a de Polignac number, because 42731573 - 2¹⁰ = 42730549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42731503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21365786 + 21365787.

It is an arithmetic number, because the mean of its divisors is an integer number (21365787).

Almost surely, 2^42731573 is an apocalyptic number.

It is an amenable number.

42731573 is a deficient number, since it is larger than the sum of its proper divisors (1).

42731573 is an equidigital number, since it uses as much as digits as its factorization.

42731573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 32.

The square root of 42731573 is about 6536.9391155188. The cubic root of 42731573 is about 349.6092864482.

The spelling of 42731573 in words is "forty-two million, seven hundred thirty-one thousand, five hundred seventy-three".