55751581 has 2 divisors, whose sum is σ = 55751582. Its totient is φ = 55751580.

The previous prime is 55751569. The next prime is 55751593. The reversal of 55751581 is 18515755.

It is a balanced prime because it is at equal distance from previous prime (55751569) and next prime (55751593).

It can be written as a sum of positive squares in only one way, i.e., 51984100 + 3767481 = 7210^2 + 1941^2 .

It is a cyclic number.

It is not a de Polignac number, because 55751581 - 2²¹ = 53654429 is a prime.

It is a super-2 number, since 2×55751581² = 6216477567999122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55751581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55751081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27875790 + 27875791.

It is an arithmetic number, because the mean of its divisors is an integer number (27875791).

Almost surely, 2^55751581 is an apocalyptic number.

It is an amenable number.

55751581 is a deficient number, since it is larger than the sum of its proper divisors (1).

55751581 is an equidigital number, since it uses as much as digits as its factorization.

55751581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35000, while the sum is 37.

The square root of 55751581 is about 7466.6981323742. The cubic root of 55751581 is about 382.0196736119.

The spelling of 55751581 in words is "fifty-five million, seven hundred fifty-one thousand, five hundred eighty-one".