51515143 has 4 divisors (see below), whose sum is σ = 51532848. Its totient is φ = 51497440.

The previous prime is 51515129. The next prime is 51515159. The reversal of 51515143 is 34151515.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34151515 = 5 ⋅6830303.

It is a cyclic number.

It is not a de Polignac number, because 51515143 - 2¹³ = 51506951 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 (51515843) 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, 3346 + ... + 10687.

It is an arithmetic number, because the mean of its divisors is an integer number (12883212).

Almost surely, 2^51515143 is an apocalyptic number.

51515143 is a deficient number, since it is larger than the sum of its proper divisors (17705).

51515143 is a wasteful number, since it uses less digits than its factorization.

51515143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17704.

The product of its digits is 1500, while the sum is 25.

The square root of 51515143 is about 7177.4050324612. The cubic root of 51515143 is about 372.0874052719.

Adding to 51515143 its reverse (34151515), we get a palindrome (85666658).

The spelling of 51515143 in words is "fifty-one million, five hundred fifteen thousand, one hundred forty-three".