261834743 has 4 divisors (see below), whose sum is σ = 266272680. Its totient is φ = 257396808.

The previous prime is 261834701. The next prime is 261834751. The reversal of 261834743 is 347438162.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261834743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261834697 and 261834706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261831743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2218880 + ... + 2218997.

It is an arithmetic number, because the mean of its divisors is an integer number (66568170).

Almost surely, 2^261834743 is an apocalyptic number.

261834743 is a deficient number, since it is larger than the sum of its proper divisors (4437937).

261834743 is an equidigital number, since it uses as much as digits as its factorization.

261834743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4437936.

The product of its digits is 96768, while the sum is 38.

The square root of 261834743 is about 16181.3084452401. The cubic root of 261834743 is about 639.7482269758.

The spelling of 261834743 in words is "two hundred sixty-one million, eight hundred thirty-four thousand, seven hundred forty-three".