56549391 has 16 divisors (see below), whose sum is σ = 78213600. Its totient is φ = 36299648.

The previous prime is 56549371. The next prime is 56549401. The reversal of 56549391 is 19394565.

It is not a de Polignac number, because 56549391 - 2¹⁰ = 56548367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56549371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43645 + ... + 44921.

It is an arithmetic number, because the mean of its divisors is an integer number (4888350).

Almost surely, 2^56549391 is an apocalyptic number.

56549391 is a deficient number, since it is larger than the sum of its proper divisors (21664209).

56549391 is a wasteful number, since it uses less digits than its factorization.

56549391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818.

The product of its digits is 145800, while the sum is 42.

The square root of 56549391 is about 7519.9329119348. The cubic root of 56549391 is about 383.8332948809.

The spelling of 56549391 in words is "fifty-six million, five hundred forty-nine thousand, three hundred ninety-one".