263121653 has 2 divisors, whose sum is σ = 263121654. Its totient is φ = 263121652.

The previous prime is 263121643. The next prime is 263121673. The reversal of 263121653 is 356121362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165842884 + 97278769 = 12878^2 + 9863^2 .

It is a cyclic number.

It is not a de Polignac number, because 263121653 - 2¹⁰ = 263120629 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263121613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131560826 + 131560827.

It is an arithmetic number, because the mean of its divisors is an integer number (131560827).

Almost surely, 2^263121653 is an apocalyptic number.

It is an amenable number.

263121653 is a deficient number, since it is larger than the sum of its proper divisors (1).

263121653 is an equidigital number, since it uses as much as digits as its factorization.

263121653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 29.

The square root of 263121653 is about 16221.0250292637. The cubic root of 263121653 is about 640.7946290222.

The spelling of 263121653 in words is "two hundred sixty-three million, one hundred twenty-one thousand, six hundred fifty-three".