261212743 has 16 divisors (see below), whose sum is σ = 288905760. Its totient is φ = 236153280.

The previous prime is 261212737. The next prime is 261212767. The reversal of 261212743 is 347212162.

It is not a de Polignac number, because 261212743 - 2¹³ = 261204551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261212243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304371 + ... + 305227.

It is an arithmetic number, because the mean of its divisors is an integer number (18056610).

Almost surely, 2^261212743 is an apocalyptic number.

261212743 is a deficient number, since it is larger than the sum of its proper divisors (27693017).

261212743 is an equidigital number, since it uses as much as digits as its factorization.

261212743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119 (or 1097 counting only the distinct ones).

The product of its digits is 4032, while the sum is 28.

The square root of 261212743 is about 16162.0773107915. The cubic root of 261212743 is about 639.2412419159.

The spelling of 261212743 in words is "two hundred sixty-one million, two hundred twelve thousand, seven hundred forty-three".