55266391 has 4 divisors (see below), whose sum is σ = 55283472. Its totient is φ = 55249312.

The previous prime is 55266389. The next prime is 55266451. The reversal of 55266391 is 19366255.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55266391 - 2¹ = 55266389 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 55266391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55266301) 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, 2035 + ... + 10708.

It is an arithmetic number, because the mean of its divisors is an integer number (13820868).

Almost surely, 2^55266391 is an apocalyptic number.

55266391 is a deficient number, since it is larger than the sum of its proper divisors (17081).

55266391 is a wasteful number, since it uses less digits than its factorization.

55266391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17080.

The product of its digits is 48600, while the sum is 37.

The square root of 55266391 is about 7434.1368698727. The cubic root of 55266391 is about 380.9082406821.

The spelling of 55266391 in words is "fifty-five million, two hundred sixty-six thousand, three hundred ninety-one".