55807919 has 6 divisors (see below), whose sum is σ = 57799560. Its totient is φ = 53882696.

The previous prime is 55807907. The next prime is 55807931. The reversal of 55807919 is 91970855.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55807907) and next prime (55807931).

It is not a de Polignac number, because 55807919 - 2⁴ = 55807903 is a prime.

It is a super-2 number, since 2×55807919² = 6229047646221122, which contains 22 as substring.

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 55807919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55807979) 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 5 ways as a sum of consecutive naturals, for example, 32339 + ... + 34020.

It is an arithmetic number, because the mean of its divisors is an integer number (9633260).

Almost surely, 2^55807919 is an apocalyptic number.

55807919 is a deficient number, since it is larger than the sum of its proper divisors (1991641).

55807919 is an equidigital number, since it uses as much as digits as its factorization.

55807919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66417 (or 66388 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 55807919 is about 7470.4697978106. The cubic root of 55807919 is about 382.1483095987.

The spelling of 55807919 in words is "fifty-five million, eight hundred seven thousand, nine hundred nineteen".