261576121393 has 2 divisors, whose sum is σ = 261576121394. Its totient is φ = 261576121392.

The previous prime is 261576121361. The next prime is 261576121423. The reversal of 261576121393 is 393121675162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230137994529 + 31438126864 = 479727^2 + 177308^2 .

It is a cyclic number.

It is not a de Polignac number, because 261576121393 - 2⁵ = 261576121361 is a prime.

It is not a weakly prime, because it can be changed into another prime (261576128393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130788060696 + 130788060697.

It is an arithmetic number, because the mean of its divisors is an integer number (130788060697).

Almost surely, 2^261576121393 is an apocalyptic number.

It is an amenable number.

261576121393 is a deficient number, since it is larger than the sum of its proper divisors (1).

261576121393 is an equidigital number, since it uses as much as digits as its factorization.

261576121393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 46.

The spelling of 261576121393 in words is "two hundred sixty-one billion, five hundred seventy-six million, one hundred twenty-one thousand, three hundred ninety-three".