51155445 has 32 divisors (see below), whose sum is σ = 89631360. Its totient is φ = 24707840.

The previous prime is 51155443. The next prime is 51155453. The reversal of 51155445 is 54455115.

51155445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51155445 - 2¹ = 51155443 is a prime.

51155445 is a modest number, since divided by 5445 gives 5115 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51155443) 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, 63787 + ... + 64583.

It is an arithmetic number, because the mean of its divisors is an integer number (2800980).

Almost surely, 2^51155445 is an apocalyptic number.

51155445 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51155445 is a deficient number, since it is larger than the sum of its proper divisors (38475915).

51155445 is a wasteful number, since it uses less digits than its factorization.

51155445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205.

The product of its digits is 10000, while the sum is 30.

The square root of 51155445 is about 7152.3034751051. The cubic root of 51155445 is about 371.2193639765.

The spelling of 51155445 in words is "fifty-one million, one hundred fifty-five thousand, four hundred forty-five".