51543491 has 2 divisors, whose sum is σ = 51543492. Its totient is φ = 51543490.

The previous prime is 51543449. The next prime is 51543497. The reversal of 51543491 is 19434515.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51543491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51543497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25771745 + 25771746.

It is an arithmetic number, because the mean of its divisors is an integer number (25771746).

Almost surely, 2^51543491 is an apocalyptic number.

51543491 is a deficient number, since it is larger than the sum of its proper divisors (1).

51543491 is an equidigital number, since it uses as much as digits as its factorization.

51543491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 32.

The square root of 51543491 is about 7179.3795692943. The cubic root of 51543491 is about 372.1556441039.

The spelling of 51543491 in words is "fifty-one million, five hundred forty-three thousand, four hundred ninety-one".