51861289 has 2 divisors, whose sum is σ = 51861290. Its totient is φ = 51861288.

The previous prime is 51861287. The next prime is 51861319. The reversal of 51861289 is 98216815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41024025 + 10837264 = 6405^2 + 3292^2 .

It is a cyclic number.

It is not a de Polignac number, because 51861289 - 2¹ = 51861287 is a prime.

Together with 51861287, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51861281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25930644 + 25930645.

It is an arithmetic number, because the mean of its divisors is an integer number (25930645).

Almost surely, 2^51861289 is an apocalyptic number.

It is an amenable number.

51861289 is a deficient number, since it is larger than the sum of its proper divisors (1).

51861289 is an equidigital number, since it uses as much as digits as its factorization.

51861289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 40.

The square root of 51861289 is about 7201.4782510260. The cubic root of 51861289 is about 372.9189352976.

The spelling of 51861289 in words is "fifty-one million, eight hundred sixty-one thousand, two hundred eighty-nine".