51432919 has 4 divisors (see below), whose sum is σ = 51803080. Its totient is φ = 51062760.

The previous prime is 51432917. The next prime is 51432961. The reversal of 51432919 is 91923415.

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

It is a cyclic number.

It is not a de Polignac number, because 51432919 - 2¹ = 51432917 is a prime.

It is a super-2 number, since 2×51432919² = 5290690313721122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51432911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184872 + ... + 185149.

It is an arithmetic number, because the mean of its divisors is an integer number (12950770).

Almost surely, 2^51432919 is an apocalyptic number.

51432919 is a deficient number, since it is larger than the sum of its proper divisors (370161).

51432919 is a wasteful number, since it uses less digits than its factorization.

51432919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370160.

The product of its digits is 9720, while the sum is 34.

The square root of 51432919 is about 7171.6747695361. The cubic root of 51432919 is about 371.8893353135.

It can be divided in two parts, 514 and 32919, that added together give a palindrome (33433).

The spelling of 51432919 in words is "fifty-one million, four hundred thirty-two thousand, nine hundred nineteen".