50551561 has 2 divisors, whose sum is σ = 50551562. Its totient is φ = 50551560.

The previous prime is 50551549. The next prime is 50551573. The reversal of 50551561 is 16515505.

It is a balanced prime because it is at equal distance from previous prime (50551549) and next prime (50551573).

It can be written as a sum of positive squares in only one way, i.e., 37454400 + 13097161 = 6120^2 + 3619^2 .

It is a cyclic number.

It is not a de Polignac number, because 50551561 - 2²¹ = 48454409 is a prime.

It is not a weakly prime, because it can be changed into another prime (50551511) 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, 25275780 + 25275781.

It is an arithmetic number, because the mean of its divisors is an integer number (25275781).

Almost surely, 2^50551561 is an apocalyptic number.

It is an amenable number.

50551561 is a deficient number, since it is larger than the sum of its proper divisors (1).

50551561 is an equidigital number, since it uses as much as digits as its factorization.

50551561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 50551561 is about 7109.9620955389. The cubic root of 50551561 is about 369.7528444358.

The spelling of 50551561 in words is "fifty million, five hundred fifty-one thousand, five hundred sixty-one".