55551801 has 16 divisors (see below), whose sum is σ = 82555200. Its totient is φ = 33020928.

The previous prime is 55551799. The next prime is 55551809. The reversal of 55551801 is 10815555.

It is not a de Polignac number, because 55551801 - 2¹ = 55551799 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55551809) 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, 27696 + ... + 29633.

It is an arithmetic number, because the mean of its divisors is an integer number (5159700).

Almost surely, 2^55551801 is an apocalyptic number.

55551801 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

55551801 is a deficient number, since it is larger than the sum of its proper divisors (27003399).

55551801 is a wasteful number, since it uses less digits than its factorization.

55551801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57368.

The product of its (nonzero) digits is 5000, while the sum is 30.

The square root of 55551801 is about 7453.3080575004. The cubic root of 55551801 is about 381.5628182044.

The spelling of 55551801 in words is "fifty-five million, five hundred fifty-one thousand, eight hundred one".