65021689 has 2 divisors, whose sum is σ = 65021690. Its totient is φ = 65021688.

The previous prime is 65021647. The next prime is 65021701. The reversal of 65021689 is 98612056.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42771600 + 22250089 = 6540^2 + 4717^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65021689 is a prime.

It is equal to p_3841777 and since 65021689 and 3841777 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (65021389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32510844 + 32510845.

It is an arithmetic number, because the mean of its divisors is an integer number (32510845).

Almost surely, 2^65021689 is an apocalyptic number.

It is an amenable number.

65021689 is a deficient number, since it is larger than the sum of its proper divisors (1).

65021689 is an equidigital number, since it uses as much as digits as its factorization.

65021689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 65021689 is about 8063.6027307898. The cubic root of 65021689 is about 402.1172916657.

The spelling of 65021689 in words is "sixty-five million, twenty-one thousand, six hundred eighty-nine".