51291923653 has 2 divisors, whose sum is σ = 51291923654. Its totient is φ = 51291923652.

The previous prime is 51291923629. The next prime is 51291923687. The reversal of 51291923653 is 35632919215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46208661444 + 5083262209 = 214962^2 + 71297^2 .

It is a cyclic number.

It is not a de Polignac number, because 51291923653 - 2¹³ = 51291915461 is a prime.

It is a super-2 number, since 2×51291923653² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51291923603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25645961826 + 25645961827.

It is an arithmetic number, because the mean of its divisors is an integer number (25645961827).

Almost surely, 2^51291923653 is an apocalyptic number.

It is an amenable number.

51291923653 is a deficient number, since it is larger than the sum of its proper divisors (1).

51291923653 is an equidigital number, since it uses as much as digits as its factorization.

51291923653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 437400, while the sum is 46.

The spelling of 51291923653 in words is "fifty-one billion, two hundred ninety-one million, nine hundred twenty-three thousand, six hundred fifty-three".