51155149 has 4 divisors (see below), whose sum is σ = 51993820. Its totient is φ = 50316480.

The previous prime is 51155147. The next prime is 51155173. The reversal of 51155149 is 94155115.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12180100 + 38975049 = 3490^2 + 6243^2 .

It is a cyclic number.

It is not a de Polignac number, because 51155149 - 2¹ = 51155147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51155149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51155147) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 419244 + ... + 419365.

It is an arithmetic number, because the mean of its divisors is an integer number (12998455).

Almost surely, 2^51155149 is an apocalyptic number.

It is an amenable number.

51155149 is a deficient number, since it is larger than the sum of its proper divisors (838671).

51155149 is an equidigital number, since it uses as much as digits as its factorization.

51155149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838670.

The product of its digits is 4500, while the sum is 31.

The square root of 51155149 is about 7152.2827824409. The cubic root of 51155149 is about 371.2186479814.

The spelling of 51155149 in words is "fifty-one million, one hundred fifty-five thousand, one hundred forty-nine".