261512743 has 2 divisors, whose sum is σ = 261512744. Its totient is φ = 261512742.

The previous prime is 261512729. The next prime is 261512761. The reversal of 261512743 is 347215162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261512743 - 2²¹ = 259415591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261512723) 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, 130756371 + 130756372.

It is an arithmetic number, because the mean of its divisors is an integer number (130756372).

Almost surely, 2^261512743 is an apocalyptic number.

261512743 is a deficient number, since it is larger than the sum of its proper divisors (1).

261512743 is an equidigital number, since it uses as much as digits as its factorization.

261512743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 261512743 is about 16171.3556327229. The cubic root of 261512743 is about 639.4858688319.

The spelling of 261512743 in words is "two hundred sixty-one million, five hundred twelve thousand, seven hundred forty-three".