42910561 has 2 divisors, whose sum is σ = 42910562. Its totient is φ = 42910560.

The previous prime is 42910513. The next prime is 42910573. The reversal of 42910561 is 16501924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39450961 + 3459600 = 6281^2 + 1860^2 .

It is a cyclic number.

It is not a de Polignac number, because 42910561 - 2¹⁷ = 42779489 is a prime.

It is not a weakly prime, because it can be changed into another prime (42910501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21455280 + 21455281.

It is an arithmetic number, because the mean of its divisors is an integer number (21455281).

Almost surely, 2^42910561 is an apocalyptic number.

It is an amenable number.

42910561 is a deficient number, since it is larger than the sum of its proper divisors (1).

42910561 is an equidigital number, since it uses as much as digits as its factorization.

42910561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 42910561 is about 6550.6153146098. The cubic root of 42910561 is about 350.0967378856.

The spelling of 42910561 in words is "forty-two million, nine hundred ten thousand, five hundred sixty-one".