51155533 has 24 divisors (see below), whose sum is σ = 64149624. Its totient is φ = 40381440.

The previous prime is 51155527. The next prime is 51155539. The reversal of 51155533 is 33555115.

It is an interprime number because it is at equal distance from previous prime (51155527) and next prime (51155539).

It can be written as a sum of positive squares in 4 ways, for example, as 14152644 + 37002889 = 3762^2 + 6083^2 .

It is not a de Polignac number, because 51155533 - 2⁵ = 51155501 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51155539) 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 23 ways as a sum of consecutive naturals, for example, 25785 + ... + 27697.

It is an arithmetic number, because the mean of its divisors is an integer number (2672901).

Almost surely, 2^51155533 is an apocalyptic number.

It is an amenable number.

51155533 is a deficient number, since it is larger than the sum of its proper divisors (12994091).

51155533 is a wasteful number, since it uses less digits than its factorization.

51155533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965 (or 1954 counting only the distinct ones).

The product of its digits is 5625, while the sum is 28.

The square root of 51155533 is about 7152.3096269667. The cubic root of 51155533 is about 371.2195768394.

It can be divided in two parts, 5115 and 5533, that added together give a cube (10648 = 22³).

The spelling of 51155533 in words is "fifty-one million, one hundred fifty-five thousand, five hundred thirty-three".