55641621 has 32 divisors (see below), whose sum is σ = 88342528. Its totient is φ = 30481920.

The previous prime is 55641583. The next prime is 55641631. The reversal of 55641621 is 12614655.

It is not a de Polignac number, because 55641621 - 2¹³ = 55633429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55641631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82341 + ... + 83013.

It is an arithmetic number, because the mean of its divisors is an integer number (2760704).

Almost surely, 2^55641621 is an apocalyptic number.

It is an amenable number.

55641621 is a deficient number, since it is larger than the sum of its proper divisors (32700907).

55641621 is a wasteful number, since it uses less digits than its factorization.

55641621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841.

The product of its digits is 7200, while the sum is 30.

The square root of 55641621 is about 7459.3311362347. The cubic root of 55641621 is about 381.7683532017.

The spelling of 55641621 in words is "fifty-five million, six hundred forty-one thousand, six hundred twenty-one".