55291145 has 32 divisors (see below), whose sum is σ = 82349568. Its totient is φ = 34702848.

The previous prime is 55291141. The next prime is 55291153. The reversal of 55291145 is 54119255.

55291145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 55291145 - 2² = 55291141 is a prime.

It is a super-2 number, since 2×55291145² = 6114221430822050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55291141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61892 + ... + 62778.

It is an arithmetic number, because the mean of its divisors is an integer number (2573424).

Almost surely, 2^55291145 is an apocalyptic number.

It is an amenable number.

55291145 is a deficient number, since it is larger than the sum of its proper divisors (27058423).

55291145 is a wasteful number, since it uses less digits than its factorization.

55291145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049.

The product of its digits is 9000, while the sum is 32.

The square root of 55291145 is about 7435.8015707790. The cubic root of 55291145 is about 380.9651022153.

The spelling of 55291145 in words is "fifty-five million, two hundred ninety-one thousand, one hundred forty-five".