51451513 has 2 divisors, whose sum is σ = 51451514. Its totient is φ = 51451512.

The previous prime is 51451501. The next prime is 51451541. The reversal of 51451513 is 31515415.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51380224 + 71289 = 7168^2 + 267^2 .

It is a cyclic number.

It is not a de Polignac number, because 51451513 - 2¹⁷ = 51320441 is a prime.

It is equal to p_3082912 and since 51451513 and 3082912 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 (51451313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25725756 + 25725757.

It is an arithmetic number, because the mean of its divisors is an integer number (25725757).

Almost surely, 2^51451513 is an apocalyptic number.

It is an amenable number.

51451513 is a deficient number, since it is larger than the sum of its proper divisors (1).

51451513 is an equidigital number, since it uses as much as digits as its factorization.

51451513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1500, while the sum is 25.

The square root of 51451513 is about 7172.9710023114. The cubic root of 51451513 is about 371.9341449886.

Adding to 51451513 its reverse (31515415), we get a palindrome (82966928).

The spelling of 51451513 in words is "fifty-one million, four hundred fifty-one thousand, five hundred thirteen".