55003391 has 4 divisors (see below), whose sum is σ = 55153632. Its totient is φ = 54853152.

The previous prime is 55003379. The next prime is 55003409. The reversal of 55003391 is 19330055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19330055 = 5 ⋅3866011.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55003391 is a prime.

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 55003391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55008391) 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, 74570 + ... + 75303.

It is an arithmetic number, because the mean of its divisors is an integer number (13788408).

Almost surely, 2^55003391 is an apocalyptic number.

55003391 is a deficient number, since it is larger than the sum of its proper divisors (150241).

55003391 is a wasteful number, since it uses less digits than its factorization.

55003391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150240.

The product of its (nonzero) digits is 2025, while the sum is 26.

The square root of 55003391 is about 7416.4271047452. The cubic root of 55003391 is about 380.3030615590.

The spelling of 55003391 in words is "fifty-five million, three thousand, three hundred ninety-one".