61741781 has 2 divisors, whose sum is σ = 61741782. Its totient is φ = 61741780.

The previous prime is 61741763. The next prime is 61741831. The reversal of 61741781 is 18714716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31820881 + 29920900 = 5641^2 + 5470^2 .

It is a cyclic number.

It is not a de Polignac number, because 61741781 - 2⁶ = 61741717 is a prime.

It is a super-2 number, since 2×61741781² = 7624095042103922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61741481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30870890 + 30870891.

It is an arithmetic number, because the mean of its divisors is an integer number (30870891).

Almost surely, 2^61741781 is an apocalyptic number.

It is an amenable number.

61741781 is a deficient number, since it is larger than the sum of its proper divisors (1).

61741781 is an equidigital number, since it uses as much as digits as its factorization.

61741781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 35.

The square root of 61741781 is about 7857.5938429013. The cubic root of 61741781 is about 395.2389325134.

The spelling of 61741781 in words is "sixty-one million, seven hundred forty-one thousand, seven hundred eighty-one".