51172543 has 2 divisors, whose sum is σ = 51172544. Its totient is φ = 51172542.

The previous prime is 51172531. The next prime is 51172547. The reversal of 51172543 is 34527115.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51172543 - 2²¹ = 49075391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51172547) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25586271 + 25586272.

It is an arithmetic number, because the mean of its divisors is an integer number (25586272).

Almost surely, 2^51172543 is an apocalyptic number.

51172543 is a deficient number, since it is larger than the sum of its proper divisors (1).

51172543 is an equidigital number, since it uses as much as digits as its factorization.

51172543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4200, while the sum is 28.

The square root of 51172543 is about 7153.4986545047. The cubic root of 51172543 is about 371.2607176823.

Adding to 51172543 its reverse (34527115), we get a palindrome (85699658).

It can be divided in two parts, 51172 and 543, that added together give a palindrome (51715).

The spelling of 51172543 in words is "fifty-one million, one hundred seventy-two thousand, five hundred forty-three".