261344541251 has 2 divisors, whose sum is σ = 261344541252. Its totient is φ = 261344541250.

The previous prime is 261344541239. The next prime is 261344541299. The reversal of 261344541251 is 152145443162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261344541251 - 2²⁶ = 261277432387 is a prime.

It is not a weakly prime, because it can be changed into another prime (261344541851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130672270625 + 130672270626.

It is an arithmetic number, because the mean of its divisors is an integer number (130672270626).

Almost surely, 2^261344541251 is an apocalyptic number.

261344541251 is a deficient number, since it is larger than the sum of its proper divisors (1).

261344541251 is an equidigital number, since it uses as much as digits as its factorization.

261344541251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 38.

The spelling of 261344541251 in words is "two hundred sixty-one billion, three hundred forty-four million, five hundred forty-one thousand, two hundred fifty-one".