51543449 has 2 divisors, whose sum is σ = 51543450. Its totient is φ = 51543448.

The previous prime is 51543419. The next prime is 51543491. The reversal of 51543449 is 94434515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46512400 + 5031049 = 6820^2 + 2243^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51543449 is a prime.

It is equal to p_3088079 and since 51543449 and 3088079 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (51543419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25771724 + 25771725.

It is an arithmetic number, because the mean of its divisors is an integer number (25771725).

Almost surely, 2^51543449 is an apocalyptic number.

It is an amenable number.

51543449 is a deficient number, since it is larger than the sum of its proper divisors (1).

51543449 is an equidigital number, since it uses as much as digits as its factorization.

51543449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 35.

The square root of 51543449 is about 7179.3766442498. The cubic root of 51543449 is about 372.1555430207.

The spelling of 51543449 in words is "fifty-one million, five hundred forty-three thousand, four hundred forty-nine".