65170121 has 2 divisors, whose sum is σ = 65170122. Its totient is φ = 65170120.

The previous prime is 65170099. The next prime is 65170123. The reversal of 65170121 is 12107156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41744521 + 23425600 = 6461^2 + 4840^2 .

It is a cyclic number.

It is not a de Polignac number, because 65170121 - 2¹⁸ = 64907977 is a prime.

Together with 65170123, 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 (65170123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32585060 + 32585061.

It is an arithmetic number, because the mean of its divisors is an integer number (32585061).

Almost surely, 2^65170121 is an apocalyptic number.

It is an amenable number.

65170121 is a deficient number, since it is larger than the sum of its proper divisors (1).

65170121 is an equidigital number, since it uses as much as digits as its factorization.

65170121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 65170121 is about 8072.8013105737. The cubic root of 65170121 is about 402.4230445831.

Adding to 65170121 its reverse (12107156), we get a palindrome (77277277).

The spelling of 65170121 in words is "sixty-five million, one hundred seventy thousand, one hundred twenty-one".