51869651 has 2 divisors, whose sum is σ = 51869652. Its totient is φ = 51869650.

The previous prime is 51869621. The next prime is 51869681. The reversal of 51869651 is 15696815.

It is a balanced prime because it is at equal distance from previous prime (51869621) and next prime (51869681).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51869651 is a prime.

It is a super-3 number, since 3×51869651³ (a number of 24 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 51869599 and 51869608.

It is not a weakly prime, because it can be changed into another prime (51869611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25934825 + 25934826.

It is an arithmetic number, because the mean of its divisors is an integer number (25934826).

Almost surely, 2^51869651 is an apocalyptic number.

51869651 is a deficient number, since it is larger than the sum of its proper divisors (1).

51869651 is an equidigital number, since it uses as much as digits as its factorization.

51869651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 41.

The square root of 51869651 is about 7202.0588028702. The cubic root of 51869651 is about 372.9389770963.

The spelling of 51869651 in words is "fifty-one million, eight hundred sixty-nine thousand, six hundred fifty-one".