51780259 has 2 divisors, whose sum is σ = 51780260. Its totient is φ = 51780258.

The previous prime is 51780257. The next prime is 51780271. The reversal of 51780259 is 95208715.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51780259 - 2¹ = 51780257 is a prime.

Together with 51780257, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51780257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25890129 + 25890130.

It is an arithmetic number, because the mean of its divisors is an integer number (25890130).

Almost surely, 2^51780259 is an apocalyptic number.

51780259 is a deficient number, since it is larger than the sum of its proper divisors (1).

51780259 is an equidigital number, since it uses as much as digits as its factorization.

51780259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 51780259 is about 7195.8501235087. The cubic root of 51780259 is about 372.7246132686.

The spelling of 51780259 in words is "fifty-one million, seven hundred eighty thousand, two hundred fifty-nine".