51432487 has 4 divisors (see below), whose sum is σ = 54139480. Its totient is φ = 48725496.

The previous prime is 51432467. The next prime is 51432499. The reversal of 51432487 is 78423415.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51432487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51432467) 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, 1353468 + ... + 1353505.

It is an arithmetic number, because the mean of its divisors is an integer number (13534870).

Almost surely, 2^51432487 is an apocalyptic number.

51432487 is a deficient number, since it is larger than the sum of its proper divisors (2706993).

51432487 is a wasteful number, since it uses less digits than its factorization.

51432487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2706992.

The product of its digits is 26880, while the sum is 34.

The square root of 51432487 is about 7171.6446509849. The cubic root of 51432487 is about 371.8882941085. Note that the first 3 decimals are identical.

The spelling of 51432487 in words is "fifty-one million, four hundred thirty-two thousand, four hundred eighty-seven".