51445487 has 2 divisors, whose sum is σ = 51445488. Its totient is φ = 51445486.

The previous prime is 51445477. The next prime is 51445517. The reversal of 51445487 is 78454415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51445487 - 2⁶ = 51445423 is a prime.

It is a Chen prime.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 51445487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51445477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25722743 + 25722744.

It is an arithmetic number, because the mean of its divisors is an integer number (25722744).

Almost surely, 2^51445487 is an apocalyptic number.

51445487 is a deficient number, since it is larger than the sum of its proper divisors (1).

51445487 is an equidigital number, since it uses as much as digits as its factorization.

51445487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 89600, while the sum is 38.

The square root of 51445487 is about 7172.5509409136. The cubic root of 51445487 is about 371.9196241156.

The spelling of 51445487 in words is "fifty-one million, four hundred forty-five thousand, four hundred eighty-seven".