51504043 has 4 divisors (see below), whose sum is σ = 51531480. Its totient is φ = 51476608.

The previous prime is 51503987. The next prime is 51504049. The reversal of 51504043 is 34040515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34040515 = 5 ⋅6808103.

It is a cyclic number.

It is not a de Polignac number, because 51504043 - 2²¹ = 49406891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51504049) 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, 10678 + ... + 14731.

It is an arithmetic number, because the mean of its divisors is an integer number (12882870).

Almost surely, 2^51504043 is an apocalyptic number.

51504043 is a deficient number, since it is larger than the sum of its proper divisors (27437).

51504043 is a wasteful number, since it uses less digits than its factorization.

51504043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27436.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 51504043 is about 7176.6317308331. The cubic root of 51504043 is about 372.0606787171.

Adding to 51504043 its reverse (34040515), we get a palindrome (85544558).

The spelling of 51504043 in words is "fifty-one million, five hundred four thousand, forty-three".