55557361 has 2 divisors, whose sum is σ = 55557362. Its totient is φ = 55557360.

The previous prime is 55557331. The next prime is 55557367. The reversal of 55557361 is 16375555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36372961 + 19184400 = 6031^2 + 4380^2 .

It is a cyclic number.

It is not a de Polignac number, because 55557361 - 2⁷ = 55557233 is a prime.

It is a super-2 number, since 2×55557361² = 6173240722568642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55557361.

It is not a weakly prime, because it can be changed into another prime (55557367) 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 as a sum of consecutive naturals, namely, 27778680 + 27778681.

It is an arithmetic number, because the mean of its divisors is an integer number (27778681).

Almost surely, 2^55557361 is an apocalyptic number.

It is an amenable number.

55557361 is a deficient number, since it is larger than the sum of its proper divisors (1).

55557361 is an equidigital number, since it uses as much as digits as its factorization.

55557361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78750, while the sum is 37.

The square root of 55557361 is about 7453.6810369106. The cubic root of 55557361 is about 381.5755475756.

The spelling of 55557361 in words is "fifty-five million, five hundred fifty-seven thousand, three hundred sixty-one".