55155519 has 8 divisors (see below), whose sum is σ = 81711920. Its totient is φ = 36770328.

The previous prime is 55155517. The next prime is 55155533. The reversal of 55155519 is 91555155.

It is a happy number.

55155519 is a `hidden beast` number, since 551 + 55 + 51 + 9 = 666.

It is not a de Polignac number, because 55155519 - 2¹ = 55155517 is a prime.

It is a super-2 number, since 2×55155519² = 6084262552318722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55155511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1021372 + ... + 1021425.

It is an arithmetic number, because the mean of its divisors is an integer number (10213990).

Almost surely, 2^55155519 is an apocalyptic number.

55155519 is a deficient number, since it is larger than the sum of its proper divisors (26556401).

55155519 is a wasteful number, since it uses less digits than its factorization.

55155519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042806 (or 2042800 counting only the distinct ones).

The product of its digits is 28125, while the sum is 36.

The square root of 55155519 is about 7426.6761744404. The cubic root of 55155519 is about 380.6533520097.

The spelling of 55155519 in words is "fifty-five million, one hundred fifty-five thousand, five hundred nineteen".