42240761 has 2 divisors, whose sum is σ = 42240762. Its totient is φ = 42240760.

The previous prime is 42240727. The next prime is 42240769. The reversal of 42240761 is 16704224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37699600 + 4541161 = 6140^2 + 2131^2 .

It is a cyclic number.

It is not a de Polignac number, because 42240761 - 2⁶ = 42240697 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 42240761.

It is not a weakly prime, because it can be changed into another prime (42240769) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21120380 + 21120381.

It is an arithmetic number, because the mean of its divisors is an integer number (21120381).

Almost surely, 2^42240761 is an apocalyptic number.

It is an amenable number.

42240761 is a deficient number, since it is larger than the sum of its proper divisors (1).

42240761 is an equidigital number, since it uses as much as digits as its factorization.

42240761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 42240761 is about 6499.2892688355. The cubic root of 42240761 is about 348.2655990843.

Adding to 42240761 its reverse (16704224), we get a palindrome (58944985).

The spelling of 42240761 in words is "forty-two million, two hundred forty thousand, seven hundred sixty-one".