51355577 has 12 divisors (see below), whose sum is σ = 64336356. Its totient is φ = 40632480.

The previous prime is 51355559. The next prime is 51355621. The reversal of 51355577 is 77555315.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3136441 + 48219136 = 1771^2 + 6944^2 .

It is not a de Polignac number, because 51355577 - 2¹² = 51351481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51355577.

It is not an unprimeable number, because it can be changed into a prime (51355517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39674 + ... + 40947.

It is an arithmetic number, because the mean of its divisors is an integer number (5361363).

Almost surely, 2^51355577 is an apocalyptic number.

It is an amenable number.

51355577 is a deficient number, since it is larger than the sum of its proper divisors (12980779).

51355577 is a wasteful number, since it uses less digits than its factorization.

51355577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80648 (or 80641 counting only the distinct ones).

The product of its digits is 91875, while the sum is 38.

The square root of 51355577 is about 7166.2805554904. The cubic root of 51355577 is about 371.7028328761.

The spelling of 51355577 in words is "fifty-one million, three hundred fifty-five thousand, five hundred seventy-seven".