51404251 has 2 divisors, whose sum is σ = 51404252. Its totient is φ = 51404250.

The previous prime is 51404237. The next prime is 51404267. The reversal of 51404251 is 15240415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51404251 - 2⁵ = 51404219 is a prime.

It is not a weakly prime, because it can be changed into another prime (51404351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25702125 + 25702126.

It is an arithmetic number, because the mean of its divisors is an integer number (25702126).

Almost surely, 2^51404251 is an apocalyptic number.

51404251 is a deficient number, since it is larger than the sum of its proper divisors (1).

51404251 is an equidigital number, since it uses as much as digits as its factorization.

51404251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 51404251 is about 7169.6757946228. The cubic root of 51404251 is about 371.8202271424.

Adding to 51404251 its reverse (15240415), we get a palindrome (66644666).

The spelling of 51404251 in words is "fifty-one million, four hundred four thousand, two hundred fifty-one".