55921801 has 16 divisors (see below), whose sum is σ = 62536320. Its totient is φ = 49674240.

The previous prime is 55921777. The next prime is 55921841. The reversal of 55921801 is 10812955.

It is a cyclic number.

It is not a de Polignac number, because 55921801 - 2⁹ = 55921289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55921841) 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, 38985 + ... + 40393.

It is an arithmetic number, because the mean of its divisors is an integer number (3908520).

Almost surely, 2^55921801 is an apocalyptic number.

55921801 is the 6106-th pentagonal number.

It is an amenable number.

55921801 is a deficient number, since it is larger than the sum of its proper divisors (6614519).

55921801 is a wasteful number, since it uses less digits than its factorization.

55921801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 55921801 is about 7478.0880577859. The cubic root of 55921801 is about 382.4080710914.

The spelling of 55921801 in words is "fifty-five million, nine hundred twenty-one thousand, eight hundred one".