51432531 has 32 divisors (see below), whose sum is σ = 76515840. Its totient is φ = 30564864.

The previous prime is 51432509. The next prime is 51432547. The reversal of 51432531 is 13523415.

It is not a de Polignac number, because 51432531 - 2⁵ = 51432499 is a prime.

It is a super-2 number, since 2×51432531² = 5290610490131922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51432551) 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 31 ways as a sum of consecutive naturals, for example, 191065 + ... + 191333.

It is an arithmetic number, because the mean of its divisors is an integer number (2391120).

Almost surely, 2^51432531 is an apocalyptic number.

51432531 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

51432531 is a deficient number, since it is larger than the sum of its proper divisors (25083309).

51432531 is a wasteful number, since it uses less digits than its factorization.

51432531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475.

The product of its digits is 1800, while the sum is 24.

The square root of 51432531 is about 7171.6477186209. The cubic root of 51432531 is about 371.8884001574. Note that the first 3 decimals are identical.

Adding to 51432531 its reverse (13523415), we get a palindrome (64955946).

The spelling of 51432531 in words is "fifty-one million, four hundred thirty-two thousand, five hundred thirty-one".