261243773 has 8 divisors (see below), whose sum is σ = 298995840. Its totient is φ = 223599600.

The previous prime is 261243767. The next prime is 261243779. The reversal of 261243773 is 377342162.

It is an interprime number because it is at equal distance from previous prime (261243767) and next prime (261243779).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261243773 - 2⁸ = 261243517 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 (261243779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21713 + ... + 31526.

It is an arithmetic number, because the mean of its divisors is an integer number (37374480).

Almost surely, 2^261243773 is an apocalyptic number.

It is an amenable number.

261243773 is a deficient number, since it is larger than the sum of its proper divisors (37752067).

261243773 is an equidigital number, since it uses as much as digits as its factorization.

261243773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53947.

The product of its digits is 42336, while the sum is 35.

The square root of 261243773 is about 16163.0372455179. The cubic root of 261243773 is about 639.2665531751.

The spelling of 261243773 in words is "two hundred sixty-one million, two hundred forty-three thousand, seven hundred seventy-three".