263542139 has 6 divisors (see below), whose sum is σ = 306569484. Its totient is φ = 225893220.

The previous prime is 263542133. The next prime is 263542159. The reversal of 263542139 is 931245362.

It is not a de Polignac number, because 263542139 - 2²⁴ = 246764923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 263542099 and 263542108.

It is not an unprimeable number, because it can be changed into a prime (263542133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2689157 + ... + 2689254.

It is an arithmetic number, because the mean of its divisors is an integer number (51094914).

Almost surely, 2^263542139 is an apocalyptic number.

263542139 is a deficient number, since it is larger than the sum of its proper divisors (43027345).

263542139 is an equidigital number, since it uses as much as digits as its factorization.

263542139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5378425 (or 5378418 counting only the distinct ones).

The product of its digits is 38880, while the sum is 35.

The square root of 263542139 is about 16233.9809966625. The cubic root of 263542139 is about 641.1357915784.

The spelling of 263542139 in words is "two hundred sixty-three million, five hundred forty-two thousand, one hundred thirty-nine".