61555841 has 2 divisors, whose sum is σ = 61555842. Its totient is φ = 61555840.

The previous prime is 61555831. The next prime is 61555849. The reversal of 61555841 is 14855516.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36954241 + 24601600 = 6079^2 + 4960^2 .

It is a cyclic number.

It is not a de Polignac number, because 61555841 - 2¹⁸ = 61293697 is a prime.

It is a super-2 number, since 2×61555841² = 7578243122434562, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61555849) 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, 30777920 + 30777921.

It is an arithmetic number, because the mean of its divisors is an integer number (30777921).

Almost surely, 2^61555841 is an apocalyptic number.

It is an amenable number.

61555841 is a deficient number, since it is larger than the sum of its proper divisors (1).

61555841 is an equidigital number, since it uses as much as digits as its factorization.

61555841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24000, while the sum is 35.

The square root of 61555841 is about 7845.7530549973. The cubic root of 61555841 is about 394.8417696636.

The spelling of 61555841 in words is "sixty-one million, five hundred fifty-five thousand, eight hundred forty-one".