51615143 has 2 divisors, whose sum is σ = 51615144. Its totient is φ = 51615142.

The previous prime is 51615139. The next prime is 51615149. The reversal of 51615143 is 34151615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51615143 - 2² = 51615139 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51615149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25807571 + 25807572.

It is an arithmetic number, because the mean of its divisors is an integer number (25807572).

Almost surely, 2^51615143 is an apocalyptic number.

51615143 is a deficient number, since it is larger than the sum of its proper divisors (1).

51615143 is an equidigital number, since it uses as much as digits as its factorization.

51615143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 26.

The square root of 51615143 is about 7184.3679610666. The cubic root of 51615143 is about 372.3280121307.

Adding to 51615143 its reverse (34151615), we get a palindrome (85766758).

The spelling of 51615143 in words is "fifty-one million, six hundred fifteen thousand, one hundred forty-three".