51451013 has 4 divisors (see below), whose sum is σ = 51535020. Its totient is φ = 51367008.

The previous prime is 51451003. The next prime is 51451021. The reversal of 51451013 is 31015415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10975969 + 40475044 = 3313^2 + 6362^2 .

It is a cyclic number.

It is not a de Polignac number, because 51451013 - 2¹² = 51446917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51451003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41078 + ... + 42311.

It is an arithmetic number, because the mean of its divisors is an integer number (12883755).

Almost surely, 2^51451013 is an apocalyptic number.

It is an amenable number.

51451013 is a deficient number, since it is larger than the sum of its proper divisors (84007).

51451013 is an equidigital number, since it uses as much as digits as its factorization.

51451013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84006.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 51451013 is about 7172.9361491651. The cubic root of 51451013 is about 371.9329401800.

Adding to 51451013 its reverse (31015415), we get a palindrome (82466428).

The spelling of 51451013 in words is "fifty-one million, four hundred fifty-one thousand, thirteen".