51155541 has 6 divisors (see below), whose sum is σ = 73891350. Its totient is φ = 34103688.

The previous prime is 51155539. The next prime is 51155551. The reversal of 51155541 is 14555115.

51155541 is a `hidden beast` number, since 5 + 115 + 5 + 541 = 666.

It can be written as a sum of positive squares in only one way, i.e., 35354916 + 15800625 = 5946^2 + 3975^2 .

It is not a de Polignac number, because 51155541 - 2¹ = 51155539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51155501) 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 5 ways as a sum of consecutive naturals, for example, 2841966 + ... + 2841983.

It is an arithmetic number, because the mean of its divisors is an integer number (12315225).

Almost surely, 2^51155541 is an apocalyptic number.

It is an amenable number.

51155541 is a deficient number, since it is larger than the sum of its proper divisors (22735809).

51155541 is a wasteful number, since it uses less digits than its factorization.

51155541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5683955 (or 5683952 counting only the distinct ones).

The product of its digits is 2500, while the sum is 27.

The square root of 51155541 is about 7152.3101862265. The cubic root of 51155541 is about 371.2195961905.

The spelling of 51155541 in words is "fifty-one million, one hundred fifty-five thousand, five hundred forty-one".