42496561 has 2 divisors, whose sum is σ = 42496562. Its totient is φ = 42496560.

The previous prime is 42496543. The next prime is 42496589. The reversal of 42496561 is 16569424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27720225 + 14776336 = 5265^2 + 3844^2 .

It is a cyclic number.

It is not a de Polignac number, because 42496561 - 2⁵ = 42496529 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42496561.

It is not a weakly prime, because it can be changed into another prime (42496511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21248280 + 21248281.

It is an arithmetic number, because the mean of its divisors is an integer number (21248281).

Almost surely, 2^42496561 is an apocalyptic number.

It is an amenable number.

42496561 is a deficient number, since it is larger than the sum of its proper divisors (1).

42496561 is an equidigital number, since it uses as much as digits as its factorization.

42496561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 42496561 is about 6518.9386406071. The cubic root of 42496561 is about 348.9671893030.

The spelling of 42496561 in words is "forty-two million, four hundred ninety-six thousand, five hundred sixty-one".