261439291039 has 2 divisors, whose sum is σ = 261439291040. Its totient is φ = 261439291038.

The previous prime is 261439291021. The next prime is 261439291063. The reversal of 261439291039 is 930192934162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261439291039 - 2²⁹ = 260902420127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261439290983 and 261439291001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261439298039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130719645519 + 130719645520.

It is an arithmetic number, because the mean of its divisors is an integer number (130719645520).

Almost surely, 2^261439291039 is an apocalyptic number.

261439291039 is a deficient number, since it is larger than the sum of its proper divisors (1).

261439291039 is an equidigital number, since it uses as much as digits as its factorization.

261439291039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 49.

The spelling of 261439291039 in words is "two hundred sixty-one billion, four hundred thirty-nine million, two hundred ninety-one thousand, thirty-nine".