55340381 has 4 divisors (see below), whose sum is σ = 57248700. Its totient is φ = 53432064.

The previous prime is 55340357. The next prime is 55340387. The reversal of 55340381 is 18304355.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18304355 = 5 ⋅3660871.

It can be written as a sum of positive squares in 2 ways, for example, as 15132100 + 40208281 = 3890^2 + 6341^2 .

It is a cyclic number.

It is not a de Polignac number, because 55340381 - 2²² = 51146077 is a prime.

It is a super-2 number, since 2×55340381² = 6125115538450322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 1908289 = 55340381 / (5 + 5 + 3 + 4 + 0 + 3 + 8 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55340387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 954116 + ... + 954173.

It is an arithmetic number, because the mean of its divisors is an integer number (14312175).

Almost surely, 2^55340381 is an apocalyptic number.

It is an amenable number.

55340381 is a deficient number, since it is larger than the sum of its proper divisors (1908319).

55340381 is a wasteful number, since it uses less digits than its factorization.

55340381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908318.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 55340381 is about 7439.1115732996. Note that the first 3 decimals coincide. The cubic root of 55340381 is about 381.0781500512.

The spelling of 55340381 in words is "fifty-five million, three hundred forty thousand, three hundred eighty-one".