61812761 has 2 divisors, whose sum is σ = 61812762. Its totient is φ = 61812760.

The previous prime is 61812749. The next prime is 61812763. The reversal of 61812761 is 16721816.

It is a happy number.

61812761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58049161 + 3763600 = 7619^2 + 1940^2 .

It is a cyclic number.

It is not a de Polignac number, because 61812761 - 2¹⁸ = 61550617 is a prime.

Together with 61812763, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (61812763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30906380 + 30906381.

It is an arithmetic number, because the mean of its divisors is an integer number (30906381).

Almost surely, 2^61812761 is an apocalyptic number.

It is an amenable number.

61812761 is a deficient number, since it is larger than the sum of its proper divisors (1).

61812761 is an equidigital number, since it uses as much as digits as its factorization.

61812761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 32.

The square root of 61812761 is about 7862.1091953750. The cubic root of 61812761 is about 395.3903335866.

The spelling of 61812761 in words is "sixty-one million, eight hundred twelve thousand, seven hundred sixty-one".