55321145 has 16 divisors (see below), whose sum is σ = 76681728. Its totient is φ = 37866240.

The previous prime is 55321129. The next prime is 55321151. The reversal of 55321145 is 54112355.

It is not a de Polignac number, because 55321145 - 2⁴ = 55321129 is a prime.

It is a super-2 number, since 2×55321145² = 6120858168222050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28649 + ... + 30518.

It is an arithmetic number, because the mean of its divisors is an integer number (4792608).

Almost surely, 2^55321145 is an apocalyptic number.

55321145 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55321145 is a deficient number, since it is larger than the sum of its proper divisors (21360583).

55321145 is a wasteful number, since it uses less digits than its factorization.

55321145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59200.

The product of its digits is 3000, while the sum is 26.

The square root of 55321145 is about 7437.8185646062. The cubic root of 55321145 is about 381.0339914057.

The spelling of 55321145 in words is "fifty-five million, three hundred twenty-one thousand, one hundred forty-five".