1012265161 has 2 divisors, whose sum is σ = 1012265162. Its totient is φ = 1012265160.

The previous prime is 1012265159. The next prime is 1012265173. The reversal of 1012265161 is 1615622101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 958521600 + 53743561 = 30960^2 + 7331^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012265161 - 2¹ = 1012265159 is a prime.

Together with 1012265159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1012265101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506132580 + 506132581.

It is an arithmetic number, because the mean of its divisors is an integer number (506132581).

Almost surely, 2^1012265161 is an apocalyptic number.

It is an amenable number.

1012265161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012265161 is an equidigital number, since it uses as much as digits as its factorization.

1012265161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1012265161 is about 31816.1148005221. The cubic root of 1012265161 is about 1004.0717850638.

Adding to 1012265161 its reverse (1615622101), we get a palindrome (2627887262).

The spelling of 1012265161 in words is "one billion, twelve million, two hundred sixty-five thousand, one hundred sixty-one".