55554391 has 4 divisors (see below), whose sum is σ = 55799352. Its totient is φ = 55309432.

The previous prime is 55554383. The next prime is 55554479. The reversal of 55554391 is 19345555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19345555 = 5 ⋅3869111.

It is a cyclic number.

It is not a de Polignac number, because 55554391 - 2³ = 55554383 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 55554391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55554491) 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, 122140 + ... + 122593.

It is an arithmetic number, because the mean of its divisors is an integer number (13949838).

Almost surely, 2^55554391 is an apocalyptic number.

55554391 is a deficient number, since it is larger than the sum of its proper divisors (244961).

55554391 is a wasteful number, since it uses less digits than its factorization.

55554391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244960.

The product of its digits is 67500, while the sum is 37.

The square root of 55554391 is about 7453.4818038283. The cubic root of 55554391 is about 381.5687479992.

It can be divided in two parts, 55554 and 391, that added together give a triangular number (55945 = T₃₃₄).

The spelling of 55554391 in words is "fifty-five million, five hundred fifty-four thousand, three hundred ninety-one".