55919687 has 2 divisors, whose sum is σ = 55919688. Its totient is φ = 55919686.

The previous prime is 55919659. The next prime is 55919711. The reversal of 55919687 is 78691955.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55919687 - 2⁶ = 55919623 is a prime.

It is a super-2 number, since 2×55919687² = 6254022788355938, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55919657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27959843 + 27959844.

It is an arithmetic number, because the mean of its divisors is an integer number (27959844).

Almost surely, 2^55919687 is an apocalyptic number.

55919687 is a deficient number, since it is larger than the sum of its proper divisors (1).

55919687 is an equidigital number, since it uses as much as digits as its factorization.

55919687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 50.

The square root of 55919687 is about 7477.9467101605. The cubic root of 55919687 is about 382.4032523336.

The spelling of 55919687 in words is "fifty-five million, nine hundred nineteen thousand, six hundred eighty-seven".