51403543 has 2 divisors, whose sum is σ = 51403544. Its totient is φ = 51403542.

The previous prime is 51403537. The next prime is 51403553. The reversal of 51403543 is 34530415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51403543 - 2⁵ = 51403511 is a prime.

It is equal to p_3080239 and since 51403543 and 3080239 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51403553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25701771 + 25701772.

It is an arithmetic number, because the mean of its divisors is an integer number (25701772).

Almost surely, 2^51403543 is an apocalyptic number.

51403543 is a deficient number, since it is larger than the sum of its proper divisors (1).

51403543 is an equidigital number, since it uses as much as digits as its factorization.

51403543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 51403543 is about 7169.6264198353. The cubic root of 51403543 is about 371.8185200856.

Adding to 51403543 its reverse (34530415), we get a palindrome (85933958).

The spelling of 51403543 in words is "fifty-one million, four hundred three thousand, five hundred forty-three".