263161421 has 2 divisors, whose sum is σ = 263161422. Its totient is φ = 263161420.

The previous prime is 263161397. The next prime is 263161433. The reversal of 263161421 is 124161362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202492900 + 60668521 = 14230^2 + 7789^2 .

It is a cyclic number.

It is not a de Polignac number, because 263161421 - 2¹⁰ = 263160397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263161021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131580710 + 131580711.

It is an arithmetic number, because the mean of its divisors is an integer number (131580711).

Almost surely, 2^263161421 is an apocalyptic number.

It is an amenable number.

263161421 is a deficient number, since it is larger than the sum of its proper divisors (1).

263161421 is an equidigital number, since it uses as much as digits as its factorization.

263161421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 263161421 is about 16222.2507994421. The cubic root of 263161421 is about 640.8269104616.

The spelling of 263161421 in words is "two hundred sixty-three million, one hundred sixty-one thousand, four hundred twenty-one".