261501743 has 4 divisors (see below), whose sum is σ = 272871408. Its totient is φ = 250132080.

The previous prime is 261501727. The next prime is 261501767. The reversal of 261501743 is 347105162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261501743 - 2⁴ = 261501727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261501043) 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 in 3 ways as a sum of consecutive naturals, for example, 5684798 + ... + 5684843.

It is an arithmetic number, because the mean of its divisors is an integer number (68217852).

Almost surely, 2^261501743 is an apocalyptic number.

261501743 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

261501743 is a deficient number, since it is larger than the sum of its proper divisors (11369665).

261501743 is a wasteful number, since it uses less digits than its factorization.

261501743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11369664.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 261501743 is about 16171.0155216053. The cubic root of 261501743 is about 639.4769024834.

The spelling of 261501743 in words is "two hundred sixty-one million, five hundred one thousand, seven hundred forty-three".