51011533 has 2 divisors, whose sum is σ = 51011534. Its totient is φ = 51011532.

The previous prime is 51011479. The next prime is 51011549. The reversal of 51011533 is 33511015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38775529 + 12236004 = 6227^2 + 3498^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51011533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51011533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51011573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25505766 + 25505767.

It is an arithmetic number, because the mean of its divisors is an integer number (25505767).

Almost surely, 2^51011533 is an apocalyptic number.

It is an amenable number.

51011533 is a deficient number, since it is larger than the sum of its proper divisors (1).

51011533 is an equidigital number, since it uses as much as digits as its factorization.

51011533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225, while the sum is 19.

The square root of 51011533 is about 7142.2358544086. The cubic root of 51011533 is about 370.8709286240.

Adding to 51011533 its reverse (33511015), we get a palindrome (84522548).

The spelling of 51011533 in words is "fifty-one million, eleven thousand, five hundred thirty-three".