51571249 has 2 divisors, whose sum is σ = 51571250. Its totient is φ = 51571248.

The previous prime is 51571243. The next prime is 51571283. The reversal of 51571249 is 94217515.

It is an a-pointer prime, because the next prime (51571283) can be obtained adding 51571249 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33872400 + 17698849 = 5820^2 + 4207^2 .

It is a cyclic number.

It is not a de Polignac number, because 51571249 - 2⁹ = 51570737 is a prime.

It is not a weakly prime, because it can be changed into another prime (51571243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25785624 + 25785625.

It is an arithmetic number, because the mean of its divisors is an integer number (25785625).

Almost surely, 2^51571249 is an apocalyptic number.

It is an amenable number.

51571249 is a deficient number, since it is larger than the sum of its proper divisors (1).

51571249 is an equidigital number, since it uses as much as digits as its factorization.

51571249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 34.

The square root of 51571249 is about 7181.3124844975. The cubic root of 51571249 is about 372.2224384577. Note that the first 3 decimals are identical.

The spelling of 51571249 in words is "fifty-one million, five hundred seventy-one thousand, two hundred forty-nine".