51342581 has 2 divisors, whose sum is σ = 51342582. Its totient is φ = 51342580.

The previous prime is 51342553. The next prime is 51342623. The reversal of 51342581 is 18524315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38626225 + 12716356 = 6215^2 + 3566^2 .

It is a cyclic number.

It is not a de Polignac number, because 51342581 - 2⁶ = 51342517 is a prime.

It is a super-2 number, since 2×51342581² = 5272121247483122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51342521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25671290 + 25671291.

It is an arithmetic number, because the mean of its divisors is an integer number (25671291).

Almost surely, 2^51342581 is an apocalyptic number.

It is an amenable number.

51342581 is a deficient number, since it is larger than the sum of its proper divisors (1).

51342581 is an equidigital number, since it uses as much as digits as its factorization.

51342581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 29.

The square root of 51342581 is about 7165.3737515917. The cubic root of 51342581 is about 371.6714759600.

Adding to 51342581 its reverse (18524315), we get a palindrome (69866896).

The spelling of 51342581 in words is "fifty-one million, three hundred forty-two thousand, five hundred eighty-one".