55821471 has 4 divisors (see below), whose sum is σ = 74428632. Its totient is φ = 37214312.

The previous prime is 55821461. The next prime is 55821473. The reversal of 55821471 is 17412855.

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 55821471 - 2⁹ = 55820959 is a prime.

It is a super-3 number, since 3×55821471³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55821473) 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, 9303576 + ... + 9303581.

It is an arithmetic number, because the mean of its divisors is an integer number (18607158).

Almost surely, 2^55821471 is an apocalyptic number.

55821471 is a deficient number, since it is larger than the sum of its proper divisors (18607161).

55821471 is a wasteful number, since it uses less digits than its factorization.

55821471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18607160.

The product of its digits is 11200, while the sum is 33.

The square root of 55821471 is about 7471.3767807547. The cubic root of 55821471 is about 382.1792398253.

The spelling of 55821471 in words is "fifty-five million, eight hundred twenty-one thousand, four hundred seventy-one".