42651761 has 2 divisors, whose sum is σ = 42651762. Its totient is φ = 42651760.

The previous prime is 42651757. The next prime is 42651769. The reversal of 42651761 is 16715624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34586161 + 8065600 = 5881^2 + 2840^2 .

It is a cyclic number.

It is not a de Polignac number, because 42651761 - 2² = 42651757 is a prime.

It is a super-2 number, since 2×42651761² = 3638345432802242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42651769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21325880 + 21325881.

It is an arithmetic number, because the mean of its divisors is an integer number (21325881).

Almost surely, 2^42651761 is an apocalyptic number.

It is an amenable number.

42651761 is a deficient number, since it is larger than the sum of its proper divisors (1).

42651761 is an equidigital number, since it uses as much as digits as its factorization.

42651761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 42651761 is about 6530.8315703285. The cubic root of 42651761 is about 349.3914895950.

The spelling of 42651761 in words is "forty-two million, six hundred fifty-one thousand, seven hundred sixty-one".