51550361 has 4 divisors (see below), whose sum is σ = 52943652. Its totient is φ = 50157072.

The previous prime is 51550349. The next prime is 51550379. The reversal of 51550361 is 16305515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22992025 + 28558336 = 4795^2 + 5344^2 .

It is a cyclic number.

It is not a de Polignac number, because 51550361 - 2⁶ = 51550297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51550361.

It is not an unprimeable number, because it can be changed into a prime (51550381) 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 in 3 ways as a sum of consecutive naturals, for example, 696590 + ... + 696663.

It is an arithmetic number, because the mean of its divisors is an integer number (13235913).

Almost surely, 2^51550361 is an apocalyptic number.

It is an amenable number.

51550361 is a deficient number, since it is larger than the sum of its proper divisors (1393291).

51550361 is a wasteful number, since it uses less digits than its factorization.

51550361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393290.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 51550361 is about 7179.8580069525. The cubic root of 51550361 is about 372.1721776865.

Adding to 51550361 its reverse (16305515), we get a palindrome (67855876).

The spelling of 51550361 in words is "fifty-one million, five hundred fifty thousand, three hundred sixty-one".