51947669 has 2 divisors, whose sum is σ = 51947670. Its totient is φ = 51947668.

The previous prime is 51947641. The next prime is 51947681. The reversal of 51947669 is 96674915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48469444 + 3478225 = 6962^2 + 1865^2 .

It is a cyclic number.

It is not a de Polignac number, because 51947669 - 2¹⁶ = 51882133 is a prime.

It is a super-2 number, since 2×51947669² = 5397120629067122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51947069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25973834 + 25973835.

It is an arithmetic number, because the mean of its divisors is an integer number (25973835).

Almost surely, 2^51947669 is an apocalyptic number.

It is an amenable number.

51947669 is a deficient number, since it is larger than the sum of its proper divisors (1).

51947669 is an equidigital number, since it uses as much as digits as its factorization.

51947669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 47.

The square root of 51947669 is about 7207.4731355725. The cubic root of 51947669 is about 373.1258646554.

The spelling of 51947669 in words is "fifty-one million, nine hundred forty-seven thousand, six hundred sixty-nine".