55831645 has 4 divisors (see below), whose sum is σ = 66997980. Its totient is φ = 44665312.

The previous prime is 55831561. The next prime is 55831663. The reversal of 55831645 is 54613855.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11249316 + 44582329 = 3354^2 + 6677^2 .

It is a cyclic number.

It is not a de Polignac number, because 55831645 - 2¹⁷ = 55700573 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5583160 + ... + 5583169.

It is an arithmetic number, because the mean of its divisors is an integer number (16749495).

Almost surely, 2^55831645 is an apocalyptic number.

It is an amenable number.

55831645 is a deficient number, since it is larger than the sum of its proper divisors (11166335).

55831645 is a wasteful number, since it uses less digits than its factorization.

55831645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11166334.

The product of its digits is 72000, while the sum is 37.

The square root of 55831645 is about 7472.0576148742. The cubic root of 55831645 is about 382.2024570290.

The spelling of 55831645 in words is "fifty-five million, eight hundred thirty-one thousand, six hundred forty-five".