261051671 has 2 divisors, whose sum is σ = 261051672. Its totient is φ = 261051670.

The previous prime is 261051611. The next prime is 261051689. The reversal of 261051671 is 176150162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261051671 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261051601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130525835 + 130525836.

It is an arithmetic number, because the mean of its divisors is an integer number (130525836).

Almost surely, 2^261051671 is an apocalyptic number.

261051671 is a deficient number, since it is larger than the sum of its proper divisors (1).

261051671 is an equidigital number, since it uses as much as digits as its factorization.

261051671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 261051671 is about 16157.0935195659. The cubic root of 261051671 is about 639.1098228091.

The spelling of 261051671 in words is "two hundred sixty-one million, fifty-one thousand, six hundred seventy-one".