51204247 has 2 divisors, whose sum is σ = 51204248. Its totient is φ = 51204246.

The previous prime is 51204229. The next prime is 51204269. The reversal of 51204247 is 74240215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51204247 - 2¹¹ = 51202199 is a prime.

It is a super-7 number, since 7×51204247⁷ (a number of 55 digits) contains 7777777 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51204347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25602123 + 25602124.

It is an arithmetic number, because the mean of its divisors is an integer number (25602124).

Almost surely, 2^51204247 is an apocalyptic number.

51204247 is a deficient number, since it is larger than the sum of its proper divisors (1).

51204247 is an equidigital number, since it uses as much as digits as its factorization.

51204247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 51204247 is about 7155.7142899923. The cubic root of 51204247 is about 371.3373735030.

The spelling of 51204247 in words is "fifty-one million, two hundred four thousand, two hundred forty-seven".