261348902389 has 2 divisors, whose sum is σ = 261348902390. Its totient is φ = 261348902388.

The previous prime is 261348902377. The next prime is 261348902401. The reversal of 261348902389 is 983209843162.

It is a balanced prime because it is at equal distance from previous prime (261348902377) and next prime (261348902401).

It can be written as a sum of positive squares in only one way, i.e., 259763508900 + 1585393489 = 509670^2 + 39817^2 .

It is a cyclic number.

It is not a de Polignac number, because 261348902389 - 2⁷ = 261348902261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261348900389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130674451194 + 130674451195.

It is an arithmetic number, because the mean of its divisors is an integer number (130674451195).

Almost surely, 2^261348902389 is an apocalyptic number.

It is an amenable number.

261348902389 is a deficient number, since it is larger than the sum of its proper divisors (1).

261348902389 is an equidigital number, since it uses as much as digits as its factorization.

261348902389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 261348902389 in words is "two hundred sixty-one billion, three hundred forty-eight million, nine hundred two thousand, three hundred eighty-nine".