51247169 has 2 divisors, whose sum is σ = 51247170. Its totient is φ = 51247168.

The previous prime is 51247139. The next prime is 51247211. The reversal of 51247169 is 96174215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35343025 + 15904144 = 5945^2 + 3988^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51247169 is a prime.

It is a super-2 number, since 2×51247169² = 5252544661029122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51247139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25623584 + 25623585.

It is an arithmetic number, because the mean of its divisors is an integer number (25623585).

Almost surely, 2^51247169 is an apocalyptic number.

It is an amenable number.

51247169 is a deficient number, since it is larger than the sum of its proper divisors (1).

51247169 is an equidigital number, since it uses as much as digits as its factorization.

51247169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 51247169 is about 7158.7128032908. The cubic root of 51247169 is about 371.4411024724.

The spelling of 51247169 in words is "fifty-one million, two hundred forty-seven thousand, one hundred sixty-nine".