263161021 has 2 divisors, whose sum is σ = 263161022. Its totient is φ = 263161020.

The previous prime is 263160973. The next prime is 263161027. The reversal of 263161021 is 120161362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247716121 + 15444900 = 15739^2 + 3930^2 .

It is a cyclic number.

It is not a de Polignac number, because 263161021 - 2¹³ = 263152829 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 263160983 and 263161001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263161027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131580510 + 131580511.

It is an arithmetic number, because the mean of its divisors is an integer number (131580511).

Almost surely, 2^263161021 is an apocalyptic number.

It is an amenable number.

263161021 is a deficient number, since it is larger than the sum of its proper divisors (1).

263161021 is an equidigital number, since it uses as much as digits as its factorization.

263161021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 263161021 is about 16222.2384706920. The cubic root of 263161021 is about 640.8265857802.

The spelling of 263161021 in words is "two hundred sixty-three million, one hundred sixty-one thousand, twenty-one".