55521641 has 8 divisors (see below), whose sum is σ = 63616320. Its totient is φ = 47467728.

The previous prime is 55521611. The next prime is 55521649. The reversal of 55521641 is 14612555.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55521641 - 2⁶ = 55521577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55521649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7211 + ... + 12768.

It is an arithmetic number, because the mean of its divisors is an integer number (7952040).

Almost surely, 2^55521641 is an apocalyptic number.

It is an amenable number.

55521641 is a deficient number, since it is larger than the sum of its proper divisors (8094679).

55521641 is a wasteful number, since it uses less digits than its factorization.

55521641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20383.

The product of its digits is 6000, while the sum is 29.

The square root of 55521641 is about 7451.2845201348. The cubic root of 55521641 is about 381.4937534298.

The spelling of 55521641 in words is "fifty-five million, five hundred twenty-one thousand, six hundred forty-one".