265506139 has 2 divisors, whose sum is σ = 265506140. Its totient is φ = 265506138.

The previous prime is 265506121. The next prime is 265506161. The reversal of 265506139 is 931605562.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 265506139 - 2²⁷ = 131288411 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 265506098 and 265506107.

It is not a weakly prime, because it can be changed into another prime (265506179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132753069 + 132753070.

It is an arithmetic number, because the mean of its divisors is an integer number (132753070).

Almost surely, 2^265506139 is an apocalyptic number.

265506139 is a deficient number, since it is larger than the sum of its proper divisors (1).

265506139 is an equidigital number, since it uses as much as digits as its factorization.

265506139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 265506139 is about 16294.3591159640. The cubic root of 265506139 is about 642.7245009746.

The spelling of 265506139 in words is "two hundred sixty-five million, five hundred six thousand, one hundred thirty-nine".