51615133 has 2 divisors, whose sum is σ = 51615134. Its totient is φ = 51615132.

The previous prime is 51615131. The next prime is 51615139. The reversal of 51615133 is 33151615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40678884 + 10936249 = 6378^2 + 3307^2 .

It is a cyclic number.

It is not a de Polignac number, because 51615133 - 2¹ = 51615131 is a prime.

Together with 51615131, it forms a pair of twin primes.

It is equal to p_3092173 and since 51615133 and 3092173 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 51615098 and 51615107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51615131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25807566 + 25807567.

It is an arithmetic number, because the mean of its divisors is an integer number (25807567).

Almost surely, 2^51615133 is an apocalyptic number.

It is an amenable number.

51615133 is a deficient number, since it is larger than the sum of its proper divisors (1).

51615133 is an equidigital number, since it uses as much as digits as its factorization.

51615133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1350, while the sum is 25.

The square root of 51615133 is about 7184.3672651111. The cubic root of 51615133 is about 372.3279880856.

Adding to 51615133 its reverse (33151615), we get a palindrome (84766748).

The spelling of 51615133 in words is "fifty-one million, six hundred fifteen thousand, one hundred thirty-three".