261050462381 has 2 divisors, whose sum is σ = 261050462382. Its totient is φ = 261050462380.

The previous prime is 261050462311. The next prime is 261050462383. The reversal of 261050462381 is 183264050162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200315324356 + 60735138025 = 447566^2 + 246445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261050462381 is a prime.

It is a super-2 number, since 2×261050462381² (a number of 24 digits) contains 22 as substring.

Together with 261050462383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261050462383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130525231190 + 130525231191.

It is an arithmetic number, because the mean of its divisors is an integer number (130525231191).

Almost surely, 2^261050462381 is an apocalyptic number.

It is an amenable number.

261050462381 is a deficient number, since it is larger than the sum of its proper divisors (1).

261050462381 is an equidigital number, since it uses as much as digits as its factorization.

261050462381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 261050462381 in words is "two hundred sixty-one billion, fifty million, four hundred sixty-two thousand, three hundred eighty-one".