55003381 has 4 divisors (see below), whose sum is σ = 58238892. Its totient is φ = 51767872.

The previous prime is 55003379. The next prime is 55003409. The reversal of 55003381 is 18330055.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18330055 = 5 ⋅3666011.

It can be written as a sum of positive squares in 2 ways, for example, as 19660356 + 35343025 = 4434^2 + 5945^2 .

It is a cyclic number.

It is not a de Polignac number, because 55003381 - 2¹ = 55003379 is a prime.

It is a super-2 number, since 2×55003381² = 6050743842862322, 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 (55006381) 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, 1617730 + ... + 1617763.

It is an arithmetic number, because the mean of its divisors is an integer number (14559723).

Almost surely, 2^55003381 is an apocalyptic number.

It is an amenable number.

55003381 is a deficient number, since it is larger than the sum of its proper divisors (3235511).

55003381 is a wasteful number, since it uses less digits than its factorization.

55003381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3235510.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 55003381 is about 7416.4264305661. The cubic root of 55003381 is about 380.3030385118.

The spelling of 55003381 in words is "fifty-five million, three thousand, three hundred eighty-one".