65121289 has 2 divisors, whose sum is σ = 65121290. Its totient is φ = 65121288.

The previous prime is 65121283. The next prime is 65121293. The reversal of 65121289 is 98212156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38937600 + 26183689 = 6240^2 + 5117^2 .

It is a cyclic number.

It is not a de Polignac number, because 65121289 - 2³ = 65121281 is a prime.

It is not a weakly prime, because it can be changed into another prime (65121281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32560644 + 32560645.

It is an arithmetic number, because the mean of its divisors is an integer number (32560645).

Almost surely, 2^65121289 is an apocalyptic number.

It is an amenable number.

65121289 is a deficient number, since it is larger than the sum of its proper divisors (1).

65121289 is an equidigital number, since it uses as much as digits as its factorization.

65121289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 34.

The square root of 65121289 is about 8069.7762670349. The cubic root of 65121289 is about 402.3225075474.

The spelling of 65121289 in words is "sixty-five million, one hundred twenty-one thousand, two hundred eighty-nine".